Case Reports

Pruritus is a subjective report of itching, which can be caused by dermatologic or systemic conditions. Pruritus accounts for about 5% of all skin adverse drug reactions (ADRs) after administration.¹ Mechanisms by which medication-induced pruritus occurs are still unknown and have been understudied. Treatment modalities also have been understudied; however, the understood method for treatment is cessation of the causative agent.²

Anticoagulants commonly are used in several conditions, including prevention of ischemic cerebrovascular accident (CVA) in patients with atrial fibrillation (AF) as well as for the treatment and prevention of deep vein thrombosis (DVT) and pulmonary embolism (PE).³ Traditionally, warfarin was the gold standard anticoagulant. With the relatively recent approval of several direct oral anticoagulants (DOACs), such as rivaroxaban, apixaban, and dabigatran, the landscape of anticoagulation is changing. One benefit of using DOACs as opposed to warfarin is that they often require less frequent laboratory monitoring. However, rare ADRs not detected during clinical trials have appeared following drug approval.⁴

In a VA anticoagulation clinic that managed more than 60 patients taking DOACs, the authors identified 2 cases of pruritus, possibly associated with DOAC agents. These 2 cases point to a higher incidence rate than the rate reported in the rivaroxaban package insert (2%).⁵ Of note, pruritus is not mentioned in the apixaban package insert.⁶

Patient 1 Case Presentation

Patient 1 was a 69-year-old male with AF who was switched to rivaroxaban after 5 years of warfarin therapy. Past medical history included iron deficiency anemia, hypertension, type 2 diabetes mellitus, systolic heart failure, hyperlipidemia, hepatic steatosis, benign prostatic hyperplasia, and gastroesophageal reflux disease. The patient reported “itching all over” soon after initiation of rivaroxaban and that the itching was intolerable and always began 90 to 120 minutes after each dose of rivaroxaban with no associated rash.

After about 6 months of treatment with rivaroxaban, the patient was switched to apixaban; however, the pruritus persisted even after the switch. The onset of itching had similar timing with regard to the apixaban doses. When apixaban was initiated, the patient also was started on amiodarone and tamsulosin. A full pharmacotherapy review of the patient’s medication list for the incidence of pruritus was conducted. Regarding amiodarone and tamsulosin, incidence of pruritus was < 1%.^7,8 Neither agent had yet been started during the rivaroxaban therapy; therefore, it was unlikely that either of these 2 medications were the causative agent of the pruritic ADR.

In response to the itching, the patient was given diphenhydramine 25 mg twice daily, taken with each dose of apixaban. Shortly thereafter, the patient reported that diphenhydramine lessened the severity of the pruritus. He was switched to loratadine 10 mg twice daily with each dose of apixaban, to avoid drowsiness as well as the increased anticholinergic ADRs of first-generation antihistamines. The patient reported that the itching was tolerable.

Patient 2 Case Presentation

Patient 2 was a 63-year-old male with AF and hypertension who was initially started on rivaroxaban and reported pruritus after about 1 month. Despite the uncomfortable itch, the patient elected to continue therapy and began diphenhydramine 25 mg daily with each dose of rivaroxaban. Diphenhydramine seemed to improve the pruritus but did not completely alleviate it. While on rivaroxaban, the patient experienced an acute drop in hemoglobin; however, no source of bleeding was found. Although the pruritus was largely resolved, he was switched to apixaban due to its favorable bleeding profile.⁹ The patient continued to have pruritus on apixaban; however, he reported that pruritus was less severe than it had been while taking rivaroxaban. The patient restarted on diphenhydramine twice daily with each dose of apixaban and reported cessation of pruritus.

Discussion

After observing both cases in relation to the timing between the administration of a DOAC and onset of pruritus, it seemed likely that the causative agent could be the DOAC. A Naranjo Nomogram was used to determine the likeliness of each drug to be the causative agent of the ADR.¹⁰ This nomogram is scaled from a low score of -4 to a high score of 13. Patients 1 and 2 had a score of 4, which is reflective of a possible ADR (score 1-4). Using the nomogram as well as the subjective information provided by the patients, it is reasonable to conclude that the pruritus was possibly associated with the use of the DOACs. Nonadherence to anticoagulants may lead to potentially fatal adverse outcomes, such as stroke. Medication-associated pruritus could lead to medication nonadherence if left unaddressed. It is notable that prescribing an antihistamine that is taken at the time of the anticoagulant dose allowed these patients with possible DOAC-associated pruritus to continue therapy with the selected anticoagulant. Further research on this topic is needed.

Pruritus is a subjective report of itching, which can be caused by dermatologic or systemic conditions. Pruritus accounts for about 5% of all skin adverse drug reactions (ADRs) after administration.¹ Mechanisms by which medication-induced pruritus occurs are still unknown and have been understudied. Treatment modalities also have been understudied; however, the understood method for treatment is cessation of the causative agent.²

Anticoagulants commonly are used in several conditions, including prevention of ischemic cerebrovascular accident (CVA) in patients with atrial fibrillation (AF) as well as for the treatment and prevention of deep vein thrombosis (DVT) and pulmonary embolism (PE).³ Traditionally, warfarin was the gold standard anticoagulant. With the relatively recent approval of several direct oral anticoagulants (DOACs), such as rivaroxaban, apixaban, and dabigatran, the landscape of anticoagulation is changing. One benefit of using DOACs as opposed to warfarin is that they often require less frequent laboratory monitoring. However, rare ADRs not detected during clinical trials have appeared following drug approval.⁴

In a VA anticoagulation clinic that managed more than 60 patients taking DOACs, the authors identified 2 cases of pruritus, possibly associated with DOAC agents. These 2 cases point to a higher incidence rate than the rate reported in the rivaroxaban package insert (2%).⁵ Of note, pruritus is not mentioned in the apixaban package insert.⁶

Patient 1 Case Presentation

Patient 1 was a 69-year-old male with AF who was switched to rivaroxaban after 5 years of warfarin therapy. Past medical history included iron deficiency anemia, hypertension, type 2 diabetes mellitus, systolic heart failure, hyperlipidemia, hepatic steatosis, benign prostatic hyperplasia, and gastroesophageal reflux disease. The patient reported “itching all over” soon after initiation of rivaroxaban and that the itching was intolerable and always began 90 to 120 minutes after each dose of rivaroxaban with no associated rash.

After about 6 months of treatment with rivaroxaban, the patient was switched to apixaban; however, the pruritus persisted even after the switch. The onset of itching had similar timing with regard to the apixaban doses. When apixaban was initiated, the patient also was started on amiodarone and tamsulosin. A full pharmacotherapy review of the patient’s medication list for the incidence of pruritus was conducted. Regarding amiodarone and tamsulosin, incidence of pruritus was < 1%.^7,8 Neither agent had yet been started during the rivaroxaban therapy; therefore, it was unlikely that either of these 2 medications were the causative agent of the pruritic ADR.

In response to the itching, the patient was given diphenhydramine 25 mg twice daily, taken with each dose of apixaban. Shortly thereafter, the patient reported that diphenhydramine lessened the severity of the pruritus. He was switched to loratadine 10 mg twice daily with each dose of apixaban, to avoid drowsiness as well as the increased anticholinergic ADRs of first-generation antihistamines. The patient reported that the itching was tolerable.

Patient 2 Case Presentation

Patient 2 was a 63-year-old male with AF and hypertension who was initially started on rivaroxaban and reported pruritus after about 1 month. Despite the uncomfortable itch, the patient elected to continue therapy and began diphenhydramine 25 mg daily with each dose of rivaroxaban. Diphenhydramine seemed to improve the pruritus but did not completely alleviate it. While on rivaroxaban, the patient experienced an acute drop in hemoglobin; however, no source of bleeding was found. Although the pruritus was largely resolved, he was switched to apixaban due to its favorable bleeding profile.⁹ The patient continued to have pruritus on apixaban; however, he reported that pruritus was less severe than it had been while taking rivaroxaban. The patient restarted on diphenhydramine twice daily with each dose of apixaban and reported cessation of pruritus.

Discussion

After observing both cases in relation to the timing between the administration of a DOAC and onset of pruritus, it seemed likely that the causative agent could be the DOAC. A Naranjo Nomogram was used to determine the likeliness of each drug to be the causative agent of the ADR.¹⁰ This nomogram is scaled from a low score of -4 to a high score of 13. Patients 1 and 2 had a score of 4, which is reflective of a possible ADR (score 1-4). Using the nomogram as well as the subjective information provided by the patients, it is reasonable to conclude that the pruritus was possibly associated with the use of the DOACs. Nonadherence to anticoagulants may lead to potentially fatal adverse outcomes, such as stroke. Medication-associated pruritus could lead to medication nonadherence if left unaddressed. It is notable that prescribing an antihistamine that is taken at the time of the anticoagulant dose allowed these patients with possible DOAC-associated pruritus to continue therapy with the selected anticoagulant. Further research on this topic is needed.

Pruritus is a subjective report of itching, which can be caused by dermatologic or systemic conditions. Pruritus accounts for about 5% of all skin adverse drug reactions (ADRs) after administration.¹ Mechanisms by which medication-induced pruritus occurs are still unknown and have been understudied. Treatment modalities also have been understudied; however, the understood method for treatment is cessation of the causative agent.²

Anticoagulants commonly are used in several conditions, including prevention of ischemic cerebrovascular accident (CVA) in patients with atrial fibrillation (AF) as well as for the treatment and prevention of deep vein thrombosis (DVT) and pulmonary embolism (PE).³ Traditionally, warfarin was the gold standard anticoagulant. With the relatively recent approval of several direct oral anticoagulants (DOACs), such as rivaroxaban, apixaban, and dabigatran, the landscape of anticoagulation is changing. One benefit of using DOACs as opposed to warfarin is that they often require less frequent laboratory monitoring. However, rare ADRs not detected during clinical trials have appeared following drug approval.⁴

In a VA anticoagulation clinic that managed more than 60 patients taking DOACs, the authors identified 2 cases of pruritus, possibly associated with DOAC agents. These 2 cases point to a higher incidence rate than the rate reported in the rivaroxaban package insert (2%).⁵ Of note, pruritus is not mentioned in the apixaban package insert.⁶

Patient 1 Case Presentation

Patient 1 was a 69-year-old male with AF who was switched to rivaroxaban after 5 years of warfarin therapy. Past medical history included iron deficiency anemia, hypertension, type 2 diabetes mellitus, systolic heart failure, hyperlipidemia, hepatic steatosis, benign prostatic hyperplasia, and gastroesophageal reflux disease. The patient reported “itching all over” soon after initiation of rivaroxaban and that the itching was intolerable and always began 90 to 120 minutes after each dose of rivaroxaban with no associated rash.

After about 6 months of treatment with rivaroxaban, the patient was switched to apixaban; however, the pruritus persisted even after the switch. The onset of itching had similar timing with regard to the apixaban doses. When apixaban was initiated, the patient also was started on amiodarone and tamsulosin. A full pharmacotherapy review of the patient’s medication list for the incidence of pruritus was conducted. Regarding amiodarone and tamsulosin, incidence of pruritus was < 1%.^7,8 Neither agent had yet been started during the rivaroxaban therapy; therefore, it was unlikely that either of these 2 medications were the causative agent of the pruritic ADR.

In response to the itching, the patient was given diphenhydramine 25 mg twice daily, taken with each dose of apixaban. Shortly thereafter, the patient reported that diphenhydramine lessened the severity of the pruritus. He was switched to loratadine 10 mg twice daily with each dose of apixaban, to avoid drowsiness as well as the increased anticholinergic ADRs of first-generation antihistamines. The patient reported that the itching was tolerable.

Patient 2 Case Presentation

Patient 2 was a 63-year-old male with AF and hypertension who was initially started on rivaroxaban and reported pruritus after about 1 month. Despite the uncomfortable itch, the patient elected to continue therapy and began diphenhydramine 25 mg daily with each dose of rivaroxaban. Diphenhydramine seemed to improve the pruritus but did not completely alleviate it. While on rivaroxaban, the patient experienced an acute drop in hemoglobin; however, no source of bleeding was found. Although the pruritus was largely resolved, he was switched to apixaban due to its favorable bleeding profile.⁹ The patient continued to have pruritus on apixaban; however, he reported that pruritus was less severe than it had been while taking rivaroxaban. The patient restarted on diphenhydramine twice daily with each dose of apixaban and reported cessation of pruritus.

Discussion

After observing both cases in relation to the timing between the administration of a DOAC and onset of pruritus, it seemed likely that the causative agent could be the DOAC. A Naranjo Nomogram was used to determine the likeliness of each drug to be the causative agent of the ADR.¹⁰ This nomogram is scaled from a low score of -4 to a high score of 13. Patients 1 and 2 had a score of 4, which is reflective of a possible ADR (score 1-4). Using the nomogram as well as the subjective information provided by the patients, it is reasonable to conclude that the pruritus was possibly associated with the use of the DOACs. Nonadherence to anticoagulants may lead to potentially fatal adverse outcomes, such as stroke. Medication-associated pruritus could lead to medication nonadherence if left unaddressed. It is notable that prescribing an antihistamine that is taken at the time of the anticoagulant dose allowed these patients with possible DOAC-associated pruritus to continue therapy with the selected anticoagulant. Further research on this topic is needed.

Take-Home Points

• Emergency physicians should be aware of radiological markers to avoid missing perilunate injuries.   
• They should have a low threshold to refer a suspected perilunate injury for urgent specialist assessment.
• Although majority of the injuries demonstrate the classical pattern, one should be aware of atypical injuries.
• The principles of early anatomic reduction and stable fixation remain the same.
• Salvage procedures are only indicated in extensive irreparable injuries.

Perilunate fracture-dislocations, rare injuries representing <10% of wrist injuries,¹ are part of a wide spectrum of high-energy trauma injuries. The typical mechanism of injury is a fall on a dorsiflexed and ulnar-deviated wrist with forces progressively traversing the scapholunate, lunocapitate, and lunotriquetral ligaments.²

In this article, we report a very unusual case of translunate, transradial, transtriquetral, transtrapezoid perilunate dislocation with multiple metacarpal neck fractures. The patient provided written informed consent for print and electronic publication of this case report.

Case Report

A fit and healthy 30-year-old male software professional fell down stairs, landed on his nondominant right hand, and sustained a high-energy wrist injury. The patient also sustained a concussion, without focal neurologic deficit, and was unable to recall the exact mechanism of the wrist injury (there were no other witnesses). Radiographs of the right wrist in the emergency department showed only a nondisplaced fracture of the neck of the second, third, fourth, and fifth metacarpals and a nondisplaced fracture of the radial styloid. 

The next day, with the patient under general anesthesia, an attempt to reduce the perilunate dislocation by manipulation was unsuccessful. Open reduction and internal fixation (ORIF) were performed through a dorsal approach; the perilunate dislocation was reduced and stabilized with lunocapitate 1.2-mm Kirschner wire (K-wire). The scapholunate and lunotriquetral ligaments were found to be intact, and the significantly displaced triquetral fracture was treated with internal fixation involving 2 minifragment screws (Figure 6).

Discussion

Perilunate injuries are classified as lesser arc injuries (purely ligamentous) or greater arc injuries (osseoligamentous). Greater arc injuries involve fracture of one or more carpal bones with associated ligamentous injuries.³ The greater or lesser arc injuries described by Mayfield and colleagues² imply a specific pattern of force transmission with axial loading in a dorsiflexed and ulnar-deviated wrist with intercarpal supination. Graham⁴ introduced a concept of inferior arc injury with the forces passing through the radiocarpal joint with fracture of the radial styloid or juxta-articular margin. Similarly, lunate fracture in perilunate dislocations was explained by Bain and colleagues⁵ in the translunate arc concept in which forces pass through the lunate bone. A study involving a literature review of translunate perilunate dislocations noted associated transradial, trans-scaphoid, transcapitate, and transtriquetral fractures in order of decreasing frequency.⁶ To our knowledge, no case of translunate perilunate dislocation with multiple carpal and metacarpal fractures with radial styloid fracture has been reported in the literature.

Our patient’s associated multiple metacarpal neck fractures can be explained by the peculiar double-impact injury with initial axial loading across the hyperextended metacarpophalangeal joint, followed by axial loading across the hyperextended and ulnar-deviated wrist, causing greater arc perilunate fracture-dislocation. The mechanism of lunate injury in this case seems to be longitudinal impaction of the capitate shearing against the volar lunate in the axial plane causing a volar lip fracture (Teisen type I), and this may be accentuated by tension in the volar radiolunate ligament.^6,7 Associated triquetral fracture in perilunate dislocation is well described in the literature.⁶ However, the trapezoid fracture in our case implies a very atypical pattern of force transmission with the arc probably passing more distally through the trapezoid laterally and the triquetrum medially.

This case, which represents a very rare fracture pattern associated with perilunate dislocation, may have been caused by the variable position of the wrist and the pattern of load transmission at time of impact. Although the majority of cases demonstrate the classical pattern described in the literature, it may not be unusual to find atypical fracture patterns, especially those associated with high-energy trauma. 

Perilunate injuries have been missed in busy emergency departments and orthopedic practices. An estimated 25% of such injuries can be missed on initial presentation.⁸ In the present case, fracture of the radial styloid provided a clue to possible more complex carpal injuries involving the scaphoid, lunate, or scapholunate ligament, as Graham⁴ suggested with the concept of the “transverse pattern” of force transmission. In this case as well, the injury was initially missed, and its extent became evident only with CT. Therefore, emergency teams should have a very low threshold for suspecting and evaluating high-energy wrist injuries.

The goal in the treatment of perilunate dislocation with multiple carpal fractures is anatomical reduction and restoration of carpal alignment—which frequently require ORIF, though acute salvage procedures like proximal row carpectomy may be considered in irreparable fractures with extensive ligament injuries.⁹ For open reduction, the approach can be dorsal, volar, or a combination. The approach in our patient’s case was dorsal. His triquetral fracture, his only displaced fracture, was treated with internal fixation. All other fractures were nondisplaced, stable, and did not warrant internal fixation.

A high index of suspicion and urgent specialist consultation are essential in suspected perilunate injuries. The injury and fracture pattern may be atypical, but the principles of early anatomical reduction and stable fixation remain the same.

Take-Home Points

• Emergency physicians should be aware of radiological markers to avoid missing perilunate injuries.   
• They should have a low threshold to refer a suspected perilunate injury for urgent specialist assessment.
• Although majority of the injuries demonstrate the classical pattern, one should be aware of atypical injuries.
• The principles of early anatomic reduction and stable fixation remain the same.
• Salvage procedures are only indicated in extensive irreparable injuries.

Perilunate fracture-dislocations, rare injuries representing <10% of wrist injuries,¹ are part of a wide spectrum of high-energy trauma injuries. The typical mechanism of injury is a fall on a dorsiflexed and ulnar-deviated wrist with forces progressively traversing the scapholunate, lunocapitate, and lunotriquetral ligaments.²

In this article, we report a very unusual case of translunate, transradial, transtriquetral, transtrapezoid perilunate dislocation with multiple metacarpal neck fractures. The patient provided written informed consent for print and electronic publication of this case report.

Case Report

A fit and healthy 30-year-old male software professional fell down stairs, landed on his nondominant right hand, and sustained a high-energy wrist injury. The patient also sustained a concussion, without focal neurologic deficit, and was unable to recall the exact mechanism of the wrist injury (there were no other witnesses). Radiographs of the right wrist in the emergency department showed only a nondisplaced fracture of the neck of the second, third, fourth, and fifth metacarpals and a nondisplaced fracture of the radial styloid. 

The next day, with the patient under general anesthesia, an attempt to reduce the perilunate dislocation by manipulation was unsuccessful. Open reduction and internal fixation (ORIF) were performed through a dorsal approach; the perilunate dislocation was reduced and stabilized with lunocapitate 1.2-mm Kirschner wire (K-wire). The scapholunate and lunotriquetral ligaments were found to be intact, and the significantly displaced triquetral fracture was treated with internal fixation involving 2 minifragment screws (Figure 6).

Discussion

Perilunate injuries are classified as lesser arc injuries (purely ligamentous) or greater arc injuries (osseoligamentous). Greater arc injuries involve fracture of one or more carpal bones with associated ligamentous injuries.³ The greater or lesser arc injuries described by Mayfield and colleagues² imply a specific pattern of force transmission with axial loading in a dorsiflexed and ulnar-deviated wrist with intercarpal supination. Graham⁴ introduced a concept of inferior arc injury with the forces passing through the radiocarpal joint with fracture of the radial styloid or juxta-articular margin. Similarly, lunate fracture in perilunate dislocations was explained by Bain and colleagues⁵ in the translunate arc concept in which forces pass through the lunate bone. A study involving a literature review of translunate perilunate dislocations noted associated transradial, trans-scaphoid, transcapitate, and transtriquetral fractures in order of decreasing frequency.⁶ To our knowledge, no case of translunate perilunate dislocation with multiple carpal and metacarpal fractures with radial styloid fracture has been reported in the literature.

Our patient’s associated multiple metacarpal neck fractures can be explained by the peculiar double-impact injury with initial axial loading across the hyperextended metacarpophalangeal joint, followed by axial loading across the hyperextended and ulnar-deviated wrist, causing greater arc perilunate fracture-dislocation. The mechanism of lunate injury in this case seems to be longitudinal impaction of the capitate shearing against the volar lunate in the axial plane causing a volar lip fracture (Teisen type I), and this may be accentuated by tension in the volar radiolunate ligament.^6,7 Associated triquetral fracture in perilunate dislocation is well described in the literature.⁶ However, the trapezoid fracture in our case implies a very atypical pattern of force transmission with the arc probably passing more distally through the trapezoid laterally and the triquetrum medially.

This case, which represents a very rare fracture pattern associated with perilunate dislocation, may have been caused by the variable position of the wrist and the pattern of load transmission at time of impact. Although the majority of cases demonstrate the classical pattern described in the literature, it may not be unusual to find atypical fracture patterns, especially those associated with high-energy trauma. 

Perilunate injuries have been missed in busy emergency departments and orthopedic practices. An estimated 25% of such injuries can be missed on initial presentation.⁸ In the present case, fracture of the radial styloid provided a clue to possible more complex carpal injuries involving the scaphoid, lunate, or scapholunate ligament, as Graham⁴ suggested with the concept of the “transverse pattern” of force transmission. In this case as well, the injury was initially missed, and its extent became evident only with CT. Therefore, emergency teams should have a very low threshold for suspecting and evaluating high-energy wrist injuries.

The goal in the treatment of perilunate dislocation with multiple carpal fractures is anatomical reduction and restoration of carpal alignment—which frequently require ORIF, though acute salvage procedures like proximal row carpectomy may be considered in irreparable fractures with extensive ligament injuries.⁹ For open reduction, the approach can be dorsal, volar, or a combination. The approach in our patient’s case was dorsal. His triquetral fracture, his only displaced fracture, was treated with internal fixation. All other fractures were nondisplaced, stable, and did not warrant internal fixation.

A high index of suspicion and urgent specialist consultation are essential in suspected perilunate injuries. The injury and fracture pattern may be atypical, but the principles of early anatomical reduction and stable fixation remain the same.

Take-Home Points

• Emergency physicians should be aware of radiological markers to avoid missing perilunate injuries.   
• They should have a low threshold to refer a suspected perilunate injury for urgent specialist assessment.
• Although majority of the injuries demonstrate the classical pattern, one should be aware of atypical injuries.
• The principles of early anatomic reduction and stable fixation remain the same.
• Salvage procedures are only indicated in extensive irreparable injuries.

Perilunate fracture-dislocations, rare injuries representing <10% of wrist injuries,¹ are part of a wide spectrum of high-energy trauma injuries. The typical mechanism of injury is a fall on a dorsiflexed and ulnar-deviated wrist with forces progressively traversing the scapholunate, lunocapitate, and lunotriquetral ligaments.²

In this article, we report a very unusual case of translunate, transradial, transtriquetral, transtrapezoid perilunate dislocation with multiple metacarpal neck fractures. The patient provided written informed consent for print and electronic publication of this case report.

Case Report

A fit and healthy 30-year-old male software professional fell down stairs, landed on his nondominant right hand, and sustained a high-energy wrist injury. The patient also sustained a concussion, without focal neurologic deficit, and was unable to recall the exact mechanism of the wrist injury (there were no other witnesses). Radiographs of the right wrist in the emergency department showed only a nondisplaced fracture of the neck of the second, third, fourth, and fifth metacarpals and a nondisplaced fracture of the radial styloid. 

The next day, with the patient under general anesthesia, an attempt to reduce the perilunate dislocation by manipulation was unsuccessful. Open reduction and internal fixation (ORIF) were performed through a dorsal approach; the perilunate dislocation was reduced and stabilized with lunocapitate 1.2-mm Kirschner wire (K-wire). The scapholunate and lunotriquetral ligaments were found to be intact, and the significantly displaced triquetral fracture was treated with internal fixation involving 2 minifragment screws (Figure 6).

Discussion

Perilunate injuries are classified as lesser arc injuries (purely ligamentous) or greater arc injuries (osseoligamentous). Greater arc injuries involve fracture of one or more carpal bones with associated ligamentous injuries.³ The greater or lesser arc injuries described by Mayfield and colleagues² imply a specific pattern of force transmission with axial loading in a dorsiflexed and ulnar-deviated wrist with intercarpal supination. Graham⁴ introduced a concept of inferior arc injury with the forces passing through the radiocarpal joint with fracture of the radial styloid or juxta-articular margin. Similarly, lunate fracture in perilunate dislocations was explained by Bain and colleagues⁵ in the translunate arc concept in which forces pass through the lunate bone. A study involving a literature review of translunate perilunate dislocations noted associated transradial, trans-scaphoid, transcapitate, and transtriquetral fractures in order of decreasing frequency.⁶ To our knowledge, no case of translunate perilunate dislocation with multiple carpal and metacarpal fractures with radial styloid fracture has been reported in the literature.

Our patient’s associated multiple metacarpal neck fractures can be explained by the peculiar double-impact injury with initial axial loading across the hyperextended metacarpophalangeal joint, followed by axial loading across the hyperextended and ulnar-deviated wrist, causing greater arc perilunate fracture-dislocation. The mechanism of lunate injury in this case seems to be longitudinal impaction of the capitate shearing against the volar lunate in the axial plane causing a volar lip fracture (Teisen type I), and this may be accentuated by tension in the volar radiolunate ligament.^6,7 Associated triquetral fracture in perilunate dislocation is well described in the literature.⁶ However, the trapezoid fracture in our case implies a very atypical pattern of force transmission with the arc probably passing more distally through the trapezoid laterally and the triquetrum medially.

This case, which represents a very rare fracture pattern associated with perilunate dislocation, may have been caused by the variable position of the wrist and the pattern of load transmission at time of impact. Although the majority of cases demonstrate the classical pattern described in the literature, it may not be unusual to find atypical fracture patterns, especially those associated with high-energy trauma. 

Perilunate injuries have been missed in busy emergency departments and orthopedic practices. An estimated 25% of such injuries can be missed on initial presentation.⁸ In the present case, fracture of the radial styloid provided a clue to possible more complex carpal injuries involving the scaphoid, lunate, or scapholunate ligament, as Graham⁴ suggested with the concept of the “transverse pattern” of force transmission. In this case as well, the injury was initially missed, and its extent became evident only with CT. Therefore, emergency teams should have a very low threshold for suspecting and evaluating high-energy wrist injuries.

The goal in the treatment of perilunate dislocation with multiple carpal fractures is anatomical reduction and restoration of carpal alignment—which frequently require ORIF, though acute salvage procedures like proximal row carpectomy may be considered in irreparable fractures with extensive ligament injuries.⁹ For open reduction, the approach can be dorsal, volar, or a combination. The approach in our patient’s case was dorsal. His triquetral fracture, his only displaced fracture, was treated with internal fixation. All other fractures were nondisplaced, stable, and did not warrant internal fixation.

A high index of suspicion and urgent specialist consultation are essential in suspected perilunate injuries. The injury and fracture pattern may be atypical, but the principles of early anatomical reduction and stable fixation remain the same.

Skin adnexal tumors (SAT) are rare tumors that make up about 1%-2% of all cutaneous malignancies. They represent a various group of benign and malignant tumors that arise from skin adnexal epithelial structures: hair follicle, pilosebaceous unit, and apocrine or eccrine sweat glands. Although this derivation provides a practical basis for classification, some tumors may exhibit a mixed or more than one line of differentiation, rendering precise classification of those neoplasms difficult, and such cases should be categorized according to prevailing phenotype. In this report, we present a patient with metastatic eccrine carcinoma. Clinical experience for metastatic disease treatment is derived from a few reports, and there are no universal treatment guidelines. Given the few reported cases and the absence of randomized clinical trials for these patients, it is important to collect clinical experiences.

Case presentation and summary

A 56-year-old African man presented with a 5-week history of multiple nontender subcutaneous skin nodules all over his body except for his palms and soles, and associated with generalized itching. He had a mass in the sole of his right foot 35 years previously in another country. The mass had recurred 15 years later and was excised again. The exact etiology of the mass was unknown to the patient. He had no other medical problems. He was on no medications and did not smoke, drink, or use recreational drugs.

His vital signs on admission were normal. Examination was significant for innumerable superficial skin nodules in the scalp, back, torso, and abdomen. The largest was in the neck and measured 4 x 2 cm. A firm right inguinal mass of 7 x 4 cm was palpable. An abdominal exam revealed large ascites but no organomegaly.

The results of laboratory tests were significant for hyponatremia 126 mEq/L (normal, 135-145), hypercalcemia of 12.2 mg/dL (8.5-10.5), with normal phosphorous of 2.5 mg/dL (2.5-4.5), parathyroid of 11.5 pg/ml (6-65), and low vitamin D level of <7 ng/ml (30-100). Other test results were: carcinoembryonic antigen (CEA), 4.36 ng/ml (0.00-2.99); alpha fetoprotein, 2.39 IU/ml (0.00-9.0); calcium 11.6 mg/dL (8.5-10.2); lactate dehydrogenase, 325 U/L (85-210); aspartate aminotransferase, 59 U/L (0-40); alanine aminotransferase 43 U/L (5-35); alkaline phosphatase, 65 u/L (50-120); albumin, 2.7 g/dL (3.8-5.2); white blood cell count, 14.1 k/uL (4.4-10.6); hemoglobin, 12.6 g/dL; and platelets, 339 k/uL (161-369).

A chest and abdomen computed-tomography scan on presentation showed presence of innumerable subcutaneous and intramuscular nodules throughout the chest, abdomen, and pelvis (Figure 1).

Discussion

Sweat gland carcinomas are very rare malignant tumors of the adnexal epithelial structures of the skin, sebaceous, hair follicle, apocrine or eccrine glands that were first described by Cornil in 1865.¹ They occur primarily in adult patients, with a peak incidence in fifth and sixth decades of life.^2,3 The etiology is unknown, but some cases have been reported to be a consequence of radiation therapy.⁴ They are almost always an incidental histologic diagnosis.^2,5 The tumors usually appear as single nodule, and multinodularity usually associated with both local and metastatic disease.⁶ There are no characteristic findings to suggest that a particular nodule may represent sweat gland carcinoma, and even if sweat gland tumor is suspected, benign counterparts are more common.

Eccrine carcinoma is the most aggressive among skin adnexal tumors. They can arise on the lower limbs, trunk, head and neck, scalp and ears, upper extremities, abdomen, and genital sites.⁷

The cells of eccrine sweat glands express low molecular weight keratin, epithelial membrane antigen, carcinoembryonic antigen, as well as S100 protein, smooth muscle actin, p63, calponin, cytokeratin 14, and bcl-2.⁸ Skin tumors with eccrine differentiation may stain for estrogen and progesterone, which has important clinical implications because those patients can be treated with hormonal therapy.⁹ Positivity for estrogen receptors does not differentiate cutaneous eccrine tumors from cutaneous metastases of breast cancers.^8,9 Androgen receptor evaluation in these cases can help distinguish between the two.¹⁰ Human epidermal growth factor receptor 2 (HER-2) is expressed in 3.5% of skin adnexal tumors.¹¹

The molecular pathogenesis of malignant adnexal tumors is not clear, but overexpression of tumor suppressor protein p16 has been described as a common feature in eccrine carcinomas.¹²

Prognostic factors for sweat gland carcinoma are difficult to identify, because of the small number of reported cases. The likely prognostic factors include size, histological type, lymph node involvement, and presence of distant metastasis. Absent of lymph node involvement correlates with 10-year disease-free survival rate of 56%, which falls to 9% if nodes are involved.¹³

There are no uniform guidelines for the treatment sweat gland carcinomas, and the clinical experience described in the literature is the only source of available information.

The treatment of choice of all subtypes of localized sweat gland carcinomas is wide surgical excision with broad tumor margins, given the propensity for local recurrences along with regional lymph node dissection in the presence of clinically positive nodes. Prophylactic lymph node resection does not seem to improve survival or decrease recurrence rates.⁷ The use of adjuvant radiotherapy to prevent local recurrence also is not well established. One report suggested radiosensitivity of these tumors, and adjuvant radiation was therefore recommended in high-risk cases (ie, large tumors of 5 cm and positive surgical margins of 1 cm) and moderate to poorly differentiated tumors with lymphovascular invasion.¹⁴ Adjuvant radiation to the involved lymph node basin is suggested in the setting of extranodal extension or extensive involvement, that is, 4 lymph nodes.¹⁵ The role of lymphadenectomy has not been adequately addressed in the literature.

The role of chemotherapy in metastatic disease is not clear, but sweat gland carcinomas are considered chemoresistant (Table). Several combinations have been used with short-term responses. In one case treated with doxorubicin, mitomycin, vincristine, and 5-FU followed by maintenance therapy, the patient achieved a complete response that lasted for 16 months.¹⁶ In another report, the treatment response was 2 years with treatment consisted of anthracyclin, cyclophosphamide, vincristine, and bloemycin.¹⁷ Other combinations used in the literature include carboplatin and paclitaxel, which led to prolonged remission.¹⁴ Cisplatin and 5-FU, or cisplatin plus cetuximab have been reported but with discouraging results.¹⁸ Results to taxanes showed conflicting results.^19,20

Skin adnexal tumors (SAT) are rare tumors that make up about 1%-2% of all cutaneous malignancies. They represent a various group of benign and malignant tumors that arise from skin adnexal epithelial structures: hair follicle, pilosebaceous unit, and apocrine or eccrine sweat glands. Although this derivation provides a practical basis for classification, some tumors may exhibit a mixed or more than one line of differentiation, rendering precise classification of those neoplasms difficult, and such cases should be categorized according to prevailing phenotype. In this report, we present a patient with metastatic eccrine carcinoma. Clinical experience for metastatic disease treatment is derived from a few reports, and there are no universal treatment guidelines. Given the few reported cases and the absence of randomized clinical trials for these patients, it is important to collect clinical experiences.

Case presentation and summary

A 56-year-old African man presented with a 5-week history of multiple nontender subcutaneous skin nodules all over his body except for his palms and soles, and associated with generalized itching. He had a mass in the sole of his right foot 35 years previously in another country. The mass had recurred 15 years later and was excised again. The exact etiology of the mass was unknown to the patient. He had no other medical problems. He was on no medications and did not smoke, drink, or use recreational drugs.

His vital signs on admission were normal. Examination was significant for innumerable superficial skin nodules in the scalp, back, torso, and abdomen. The largest was in the neck and measured 4 x 2 cm. A firm right inguinal mass of 7 x 4 cm was palpable. An abdominal exam revealed large ascites but no organomegaly.

The results of laboratory tests were significant for hyponatremia 126 mEq/L (normal, 135-145), hypercalcemia of 12.2 mg/dL (8.5-10.5), with normal phosphorous of 2.5 mg/dL (2.5-4.5), parathyroid of 11.5 pg/ml (6-65), and low vitamin D level of <7 ng/ml (30-100). Other test results were: carcinoembryonic antigen (CEA), 4.36 ng/ml (0.00-2.99); alpha fetoprotein, 2.39 IU/ml (0.00-9.0); calcium 11.6 mg/dL (8.5-10.2); lactate dehydrogenase, 325 U/L (85-210); aspartate aminotransferase, 59 U/L (0-40); alanine aminotransferase 43 U/L (5-35); alkaline phosphatase, 65 u/L (50-120); albumin, 2.7 g/dL (3.8-5.2); white blood cell count, 14.1 k/uL (4.4-10.6); hemoglobin, 12.6 g/dL; and platelets, 339 k/uL (161-369).

A chest and abdomen computed-tomography scan on presentation showed presence of innumerable subcutaneous and intramuscular nodules throughout the chest, abdomen, and pelvis (Figure 1).

Discussion

Sweat gland carcinomas are very rare malignant tumors of the adnexal epithelial structures of the skin, sebaceous, hair follicle, apocrine or eccrine glands that were first described by Cornil in 1865.¹ They occur primarily in adult patients, with a peak incidence in fifth and sixth decades of life.^2,3 The etiology is unknown, but some cases have been reported to be a consequence of radiation therapy.⁴ They are almost always an incidental histologic diagnosis.^2,5 The tumors usually appear as single nodule, and multinodularity usually associated with both local and metastatic disease.⁶ There are no characteristic findings to suggest that a particular nodule may represent sweat gland carcinoma, and even if sweat gland tumor is suspected, benign counterparts are more common.

Eccrine carcinoma is the most aggressive among skin adnexal tumors. They can arise on the lower limbs, trunk, head and neck, scalp and ears, upper extremities, abdomen, and genital sites.⁷

The cells of eccrine sweat glands express low molecular weight keratin, epithelial membrane antigen, carcinoembryonic antigen, as well as S100 protein, smooth muscle actin, p63, calponin, cytokeratin 14, and bcl-2.⁸ Skin tumors with eccrine differentiation may stain for estrogen and progesterone, which has important clinical implications because those patients can be treated with hormonal therapy.⁹ Positivity for estrogen receptors does not differentiate cutaneous eccrine tumors from cutaneous metastases of breast cancers.^8,9 Androgen receptor evaluation in these cases can help distinguish between the two.¹⁰ Human epidermal growth factor receptor 2 (HER-2) is expressed in 3.5% of skin adnexal tumors.¹¹

The molecular pathogenesis of malignant adnexal tumors is not clear, but overexpression of tumor suppressor protein p16 has been described as a common feature in eccrine carcinomas.¹²

Prognostic factors for sweat gland carcinoma are difficult to identify, because of the small number of reported cases. The likely prognostic factors include size, histological type, lymph node involvement, and presence of distant metastasis. Absent of lymph node involvement correlates with 10-year disease-free survival rate of 56%, which falls to 9% if nodes are involved.¹³

There are no uniform guidelines for the treatment sweat gland carcinomas, and the clinical experience described in the literature is the only source of available information.

The treatment of choice of all subtypes of localized sweat gland carcinomas is wide surgical excision with broad tumor margins, given the propensity for local recurrences along with regional lymph node dissection in the presence of clinically positive nodes. Prophylactic lymph node resection does not seem to improve survival or decrease recurrence rates.⁷ The use of adjuvant radiotherapy to prevent local recurrence also is not well established. One report suggested radiosensitivity of these tumors, and adjuvant radiation was therefore recommended in high-risk cases (ie, large tumors of 5 cm and positive surgical margins of 1 cm) and moderate to poorly differentiated tumors with lymphovascular invasion.¹⁴ Adjuvant radiation to the involved lymph node basin is suggested in the setting of extranodal extension or extensive involvement, that is, 4 lymph nodes.¹⁵ The role of lymphadenectomy has not been adequately addressed in the literature.

The role of chemotherapy in metastatic disease is not clear, but sweat gland carcinomas are considered chemoresistant (Table). Several combinations have been used with short-term responses. In one case treated with doxorubicin, mitomycin, vincristine, and 5-FU followed by maintenance therapy, the patient achieved a complete response that lasted for 16 months.¹⁶ In another report, the treatment response was 2 years with treatment consisted of anthracyclin, cyclophosphamide, vincristine, and bloemycin.¹⁷ Other combinations used in the literature include carboplatin and paclitaxel, which led to prolonged remission.¹⁴ Cisplatin and 5-FU, or cisplatin plus cetuximab have been reported but with discouraging results.¹⁸ Results to taxanes showed conflicting results.^19,20

Skin adnexal tumors (SAT) are rare tumors that make up about 1%-2% of all cutaneous malignancies. They represent a various group of benign and malignant tumors that arise from skin adnexal epithelial structures: hair follicle, pilosebaceous unit, and apocrine or eccrine sweat glands. Although this derivation provides a practical basis for classification, some tumors may exhibit a mixed or more than one line of differentiation, rendering precise classification of those neoplasms difficult, and such cases should be categorized according to prevailing phenotype. In this report, we present a patient with metastatic eccrine carcinoma. Clinical experience for metastatic disease treatment is derived from a few reports, and there are no universal treatment guidelines. Given the few reported cases and the absence of randomized clinical trials for these patients, it is important to collect clinical experiences.

Case presentation and summary

A 56-year-old African man presented with a 5-week history of multiple nontender subcutaneous skin nodules all over his body except for his palms and soles, and associated with generalized itching. He had a mass in the sole of his right foot 35 years previously in another country. The mass had recurred 15 years later and was excised again. The exact etiology of the mass was unknown to the patient. He had no other medical problems. He was on no medications and did not smoke, drink, or use recreational drugs.

His vital signs on admission were normal. Examination was significant for innumerable superficial skin nodules in the scalp, back, torso, and abdomen. The largest was in the neck and measured 4 x 2 cm. A firm right inguinal mass of 7 x 4 cm was palpable. An abdominal exam revealed large ascites but no organomegaly.

The results of laboratory tests were significant for hyponatremia 126 mEq/L (normal, 135-145), hypercalcemia of 12.2 mg/dL (8.5-10.5), with normal phosphorous of 2.5 mg/dL (2.5-4.5), parathyroid of 11.5 pg/ml (6-65), and low vitamin D level of <7 ng/ml (30-100). Other test results were: carcinoembryonic antigen (CEA), 4.36 ng/ml (0.00-2.99); alpha fetoprotein, 2.39 IU/ml (0.00-9.0); calcium 11.6 mg/dL (8.5-10.2); lactate dehydrogenase, 325 U/L (85-210); aspartate aminotransferase, 59 U/L (0-40); alanine aminotransferase 43 U/L (5-35); alkaline phosphatase, 65 u/L (50-120); albumin, 2.7 g/dL (3.8-5.2); white blood cell count, 14.1 k/uL (4.4-10.6); hemoglobin, 12.6 g/dL; and platelets, 339 k/uL (161-369).

A chest and abdomen computed-tomography scan on presentation showed presence of innumerable subcutaneous and intramuscular nodules throughout the chest, abdomen, and pelvis (Figure 1).

Discussion

Sweat gland carcinomas are very rare malignant tumors of the adnexal epithelial structures of the skin, sebaceous, hair follicle, apocrine or eccrine glands that were first described by Cornil in 1865.¹ They occur primarily in adult patients, with a peak incidence in fifth and sixth decades of life.^2,3 The etiology is unknown, but some cases have been reported to be a consequence of radiation therapy.⁴ They are almost always an incidental histologic diagnosis.^2,5 The tumors usually appear as single nodule, and multinodularity usually associated with both local and metastatic disease.⁶ There are no characteristic findings to suggest that a particular nodule may represent sweat gland carcinoma, and even if sweat gland tumor is suspected, benign counterparts are more common.

Eccrine carcinoma is the most aggressive among skin adnexal tumors. They can arise on the lower limbs, trunk, head and neck, scalp and ears, upper extremities, abdomen, and genital sites.⁷

The cells of eccrine sweat glands express low molecular weight keratin, epithelial membrane antigen, carcinoembryonic antigen, as well as S100 protein, smooth muscle actin, p63, calponin, cytokeratin 14, and bcl-2.⁸ Skin tumors with eccrine differentiation may stain for estrogen and progesterone, which has important clinical implications because those patients can be treated with hormonal therapy.⁹ Positivity for estrogen receptors does not differentiate cutaneous eccrine tumors from cutaneous metastases of breast cancers.^8,9 Androgen receptor evaluation in these cases can help distinguish between the two.¹⁰ Human epidermal growth factor receptor 2 (HER-2) is expressed in 3.5% of skin adnexal tumors.¹¹

The molecular pathogenesis of malignant adnexal tumors is not clear, but overexpression of tumor suppressor protein p16 has been described as a common feature in eccrine carcinomas.¹²

Prognostic factors for sweat gland carcinoma are difficult to identify, because of the small number of reported cases. The likely prognostic factors include size, histological type, lymph node involvement, and presence of distant metastasis. Absent of lymph node involvement correlates with 10-year disease-free survival rate of 56%, which falls to 9% if nodes are involved.¹³

There are no uniform guidelines for the treatment sweat gland carcinomas, and the clinical experience described in the literature is the only source of available information.

The treatment of choice of all subtypes of localized sweat gland carcinomas is wide surgical excision with broad tumor margins, given the propensity for local recurrences along with regional lymph node dissection in the presence of clinically positive nodes. Prophylactic lymph node resection does not seem to improve survival or decrease recurrence rates.⁷ The use of adjuvant radiotherapy to prevent local recurrence also is not well established. One report suggested radiosensitivity of these tumors, and adjuvant radiation was therefore recommended in high-risk cases (ie, large tumors of 5 cm and positive surgical margins of 1 cm) and moderate to poorly differentiated tumors with lymphovascular invasion.¹⁴ Adjuvant radiation to the involved lymph node basin is suggested in the setting of extranodal extension or extensive involvement, that is, 4 lymph nodes.¹⁵ The role of lymphadenectomy has not been adequately addressed in the literature.

The role of chemotherapy in metastatic disease is not clear, but sweat gland carcinomas are considered chemoresistant (Table). Several combinations have been used with short-term responses. In one case treated with doxorubicin, mitomycin, vincristine, and 5-FU followed by maintenance therapy, the patient achieved a complete response that lasted for 16 months.¹⁶ In another report, the treatment response was 2 years with treatment consisted of anthracyclin, cyclophosphamide, vincristine, and bloemycin.¹⁷ Other combinations used in the literature include carboplatin and paclitaxel, which led to prolonged remission.¹⁴ Cisplatin and 5-FU, or cisplatin plus cetuximab have been reported but with discouraging results.¹⁸ Results to taxanes showed conflicting results.^19,20

Autoimmune hemolytic anemia (AIHA) is characterized by the temperature at which the auto-antibody has the greatest avidity for the target red cell antigen, either warm or cold forms. It is detected by a positive direct antiglobulin test (DAT) also known as the direct Coombs test. DAT is used to determine if red cells have been coated in vivo with immunoglobulin, complement, or both.¹ Some causes of a positive DAT include hemolytic transfusion reactions, hemolytic disease of the fetus and newborn, AIHA, and drug-induced immune hemolysis.

Case presentation and summary

A 58-year-old woman from Brazil with past medical history only significant for cholecystectomy and cesarean section had been visiting in United States for 2 months when she presented to an outside hospital with fever, shortness of breath, and syncope that had resulted in a foot injury. She reported she had been feeling short of breath and had a nonproductive cough and malaise for about 2 weeks before presentation with sick contacts at home. On admission it was noted that she had a hemoglobin level of 7.7 g/dL (normal, 12.0-15.5 g/dL; MCV, 94 fL), total bilirubin of 2.14 mg/dL (normal, 0.2-1.0 mg/dL), and lactate dehydrogenase of 523 U/L (normal, 81-234 U/L). There were no signs of bleeding on her examination. Her DAT was positive and moderate red blood cell agglutination was reported. During the first admission at the outside hospital she was diagnosed with influenza A and completed a full course of oseltamivir (75 mg po twice daily for 5 days). A chest X-ray was negative for infiltrates and showed that the patient’s lung fields were clear. She was transfused 2 units of packed red blood cells with response in hemoglobin up to 9.8 g/dL. The patient was treated with dexamethasone (4 mg IV Q8) as an inpatient and was discharged on a prednisone taper (40 mg, with taper by 10 mg every 3 days) with hemoglobin of 8.1 g/dL.

The patient continued to have nonproductive cough, dyspnea, fevers, chills, and generalized weakness, when she returned to the same outside hospital’s emergency department 2 days after her discharge. At that time, it was noted that she had leucocytosis (white blood cell count, 34.6 x 10⁹ per L), a hemoglobin level of 6.8 g/dL, and her total bilirubin level was 6.9 mg/dL. Her hemodynamics were unstable and she was admitted to their intensive care unit. The results of a chest X-ray revealed right lung consolidation.

The day after this admission, her hemoglobin level fell to 4.7 g/dL, and she was transfused 2 units of packed red blood cells before being transferred to our hospital. A chest X-ray at our hospital confirmed a right lung infiltrate. Vancomycin (1,250 mg IV Q12), levaquin (750 mg IV Q24), and maxipime (1 g IV Q12) were initiated for pneumonia and the patient was transferred to our hospital’s intensive care unit. She was afebrile at 98.3°F, her pulse rate was 84 beats per minute, she was tachypneic with respiratory rate of 26 breaths per minute, her blood pressure was 98/51 mmHg, and she had an oxygen saturation of 99% on 2L oxygen via nasal cannula.

On physical examination she was noted to have scleral icterus and was in mild respiratory distress. A chest X-ray revealed a patchy opacity in the right mid to lower lung. Her initial complete blood panel revealed anemia, with hemoglobin, 6.3 g/dL; white blood cell count, 27 x 10⁹ per L; and platelets, 533 x 10⁹ per L. The patient was then transfused another 2 units of packed red blood cells. She was given intravenous hydration, acetaminophen, and albuterol nebulizer treatments as supportive care. She was provided with blankets to keep warm. In addition to her antibiotics, she was also given prednisone 70 mg for her respiratory symptoms.

Further tests revealed haptoglobin, <30 mg/dL (normal, 36-195 mg/dL); lactate dehydrogenase, 371 U/L (normal, 98-192 U/L); and complements C3, 90 mg/dL (normal, 79-152 mg/dL) and C4, <8 mg/dL (normal, 18-55 mg/dL). Her DAT was positive, and agglutination was seen on peripheral smear (Figure 1). This was her second positive DAT as she had positive one at the outside hospital initially. Her tests for mycoplasma pneumonia, the PCR and IgM, were negative, as were the Monospot for mononucleosis and the ANA for autoimmune disorders. Her cold agglutinin titer was 1:256 (normal, no agglutination <1:64). The patient’s repeat respiratory viral panel was negative given recent full treatment for her influenza A at the previous hospital. Her blood and urine cultures were negative.

Figures 2 and 3 illustrate her hemoglobin and reticulocyte trend during her admission at our hospital.

Discussion

The incidence of cold AIHA or cold agglutinin disease (CAD) occurs about 4 per 1 million people and commonly affects women more often than men.² The cause of CAD can be subdivided into primary, idiopathic, or secondary causes, which can include infections, malignancies, or benign diseases.^3,4 Primary CAD is a chronic disorder that is generally seen in older women. Secondary CAD can be associated with B-cell lymphoproliferative disorders, such as Waldenstrom macroglobulinemia or chronic lymphocytic leukemia, and infectious agents such as Mycoplasma pneumoniae and mononucleosis caused by Epstein-Barr virus.

Mild hemolysis or acrocyanosis may occur with exposure to cold. The blood smear in CAD demonstrates red blood cell agglutination or clumping, polychromasia, and an absence of spherocytosis. In general, most cases require no treatment, but cytotoxic agents or rituximab can be used to treat more severe cases. Appropriate treatment for infectious causes of CAD includes supportive care aimed at the underlying disease process. In addition, it is helpful to keep the patient warm. There is no role for steroid therapy in CAD unlike in warm AIHA. However, our patient was symptomatic from her pneumonia, so we added steroids to help with her pulmonary insult.

The patient had a cold agglutinin titer of 1:256. Titers of 1:32 or higher are considered elevated by this technique. Elevated titers are generally rarely seen except in primary atypical pneumonia due to either M. pneumoniae, influenza A, influenza B, parainfluenza, and adenovirus, and in certain hemolytic anemias. Low titers of cold agglutinins have been demonstrated in malaria, peripheral vascular disease, and common respiratory diseases.

Warm AIHA is caused by IgG antibody activities at body temperature or at 98.6°F. They may or may not bind complement and are removed from circulation by the spleen. Cold AIHA is due to IgM antibodies coating red cells at lower temperatures. They bind complement and lead to red blood cell destruction of agglutinated cells. If the antibody is active at temperatures approaching 98.6°F, clinically significant intravascular and sometimes extravascular complement-mediated hemolysis occur in the liver.⁵

The incidence of warm AIHA occurs about 10 per 1 million people and affects women twice often as men.² It can be primary or idiopathic, or associated with various underlying conditions, including autoimmune disorders, immunodeficiency syndromes, lymphoproliferative disorders, other malignancies, and certain drugs. In more severe cases, jaundice and splenomegaly may occur. The blood smear in warm AIHA demonstrates variable spherocytosis, polychromasia, and rare erythrophagocytosis. Treatment usually includes steroids, cytotoxic agents, and splenectomy in severe cases.

There have been few case reports describing influenza as a cause of cold agglutinin hemolytic anemia. Chen and colleagues reported a case of influenza A infection in a 22-month-old boy.⁶Schoindre and colleagues reported the case of a 60-year-old woman infected with influenza A H1N1 virus who died from CAD.⁷ Shizuma reported the case of a 67-year-old man with alcoholic cirrhosis who developed a mixed hemolytic anemia and was positive for influenza A.⁸Our patient presented with influenza A, which had been diagnosed by respiratory virus panel at a different hospital, and she was anemic at the time of presentation to the outside hospital, with a positive DAT test. She was treated for influenza A with a full course of osltamivir and then returned with complaints of worsening fatigue and was again noted to be anemic with the development of patchy opacities on chest X-ray. The patient was subsequently transferred to our hospital and remained anemic during the course of her treatment. She received supportive care for her underlying influenza A and had symptomatic improvement. She ultimately decided the she would like to pursue further treatment in her native country and was discharged.

In conclusion, this case represents a rare complication of a common illness. Few cases of influenza causing hemolytic anemia have been reported in the literature. There have been reports of oseltamivir causing hemolytic anemia, but our patient presented with evidence of hemolytic anemia before initiation of the medication. In all the aforementioned cases, the patients died as a result of comorbid conditions. Our patient was stable enough to be discharged from the hospital after treatment of her comorbid conditions.

Acknowledgment
The authors thank David Henry, MD, at Pennsylvania Hospital, Philadelphia, for sharing this case and for his guidance during this patient’s treatment.

Autoimmune hemolytic anemia (AIHA) is characterized by the temperature at which the auto-antibody has the greatest avidity for the target red cell antigen, either warm or cold forms. It is detected by a positive direct antiglobulin test (DAT) also known as the direct Coombs test. DAT is used to determine if red cells have been coated in vivo with immunoglobulin, complement, or both.¹ Some causes of a positive DAT include hemolytic transfusion reactions, hemolytic disease of the fetus and newborn, AIHA, and drug-induced immune hemolysis.

Case presentation and summary

A 58-year-old woman from Brazil with past medical history only significant for cholecystectomy and cesarean section had been visiting in United States for 2 months when she presented to an outside hospital with fever, shortness of breath, and syncope that had resulted in a foot injury. She reported she had been feeling short of breath and had a nonproductive cough and malaise for about 2 weeks before presentation with sick contacts at home. On admission it was noted that she had a hemoglobin level of 7.7 g/dL (normal, 12.0-15.5 g/dL; MCV, 94 fL), total bilirubin of 2.14 mg/dL (normal, 0.2-1.0 mg/dL), and lactate dehydrogenase of 523 U/L (normal, 81-234 U/L). There were no signs of bleeding on her examination. Her DAT was positive and moderate red blood cell agglutination was reported. During the first admission at the outside hospital she was diagnosed with influenza A and completed a full course of oseltamivir (75 mg po twice daily for 5 days). A chest X-ray was negative for infiltrates and showed that the patient’s lung fields were clear. She was transfused 2 units of packed red blood cells with response in hemoglobin up to 9.8 g/dL. The patient was treated with dexamethasone (4 mg IV Q8) as an inpatient and was discharged on a prednisone taper (40 mg, with taper by 10 mg every 3 days) with hemoglobin of 8.1 g/dL.

The patient continued to have nonproductive cough, dyspnea, fevers, chills, and generalized weakness, when she returned to the same outside hospital’s emergency department 2 days after her discharge. At that time, it was noted that she had leucocytosis (white blood cell count, 34.6 x 10⁹ per L), a hemoglobin level of 6.8 g/dL, and her total bilirubin level was 6.9 mg/dL. Her hemodynamics were unstable and she was admitted to their intensive care unit. The results of a chest X-ray revealed right lung consolidation.

The day after this admission, her hemoglobin level fell to 4.7 g/dL, and she was transfused 2 units of packed red blood cells before being transferred to our hospital. A chest X-ray at our hospital confirmed a right lung infiltrate. Vancomycin (1,250 mg IV Q12), levaquin (750 mg IV Q24), and maxipime (1 g IV Q12) were initiated for pneumonia and the patient was transferred to our hospital’s intensive care unit. She was afebrile at 98.3°F, her pulse rate was 84 beats per minute, she was tachypneic with respiratory rate of 26 breaths per minute, her blood pressure was 98/51 mmHg, and she had an oxygen saturation of 99% on 2L oxygen via nasal cannula.

On physical examination she was noted to have scleral icterus and was in mild respiratory distress. A chest X-ray revealed a patchy opacity in the right mid to lower lung. Her initial complete blood panel revealed anemia, with hemoglobin, 6.3 g/dL; white blood cell count, 27 x 10⁹ per L; and platelets, 533 x 10⁹ per L. The patient was then transfused another 2 units of packed red blood cells. She was given intravenous hydration, acetaminophen, and albuterol nebulizer treatments as supportive care. She was provided with blankets to keep warm. In addition to her antibiotics, she was also given prednisone 70 mg for her respiratory symptoms.

Further tests revealed haptoglobin, <30 mg/dL (normal, 36-195 mg/dL); lactate dehydrogenase, 371 U/L (normal, 98-192 U/L); and complements C3, 90 mg/dL (normal, 79-152 mg/dL) and C4, <8 mg/dL (normal, 18-55 mg/dL). Her DAT was positive, and agglutination was seen on peripheral smear (Figure 1). This was her second positive DAT as she had positive one at the outside hospital initially. Her tests for mycoplasma pneumonia, the PCR and IgM, were negative, as were the Monospot for mononucleosis and the ANA for autoimmune disorders. Her cold agglutinin titer was 1:256 (normal, no agglutination <1:64). The patient’s repeat respiratory viral panel was negative given recent full treatment for her influenza A at the previous hospital. Her blood and urine cultures were negative.

Figures 2 and 3 illustrate her hemoglobin and reticulocyte trend during her admission at our hospital.

Discussion

The incidence of cold AIHA or cold agglutinin disease (CAD) occurs about 4 per 1 million people and commonly affects women more often than men.² The cause of CAD can be subdivided into primary, idiopathic, or secondary causes, which can include infections, malignancies, or benign diseases.^3,4 Primary CAD is a chronic disorder that is generally seen in older women. Secondary CAD can be associated with B-cell lymphoproliferative disorders, such as Waldenstrom macroglobulinemia or chronic lymphocytic leukemia, and infectious agents such as Mycoplasma pneumoniae and mononucleosis caused by Epstein-Barr virus.

Mild hemolysis or acrocyanosis may occur with exposure to cold. The blood smear in CAD demonstrates red blood cell agglutination or clumping, polychromasia, and an absence of spherocytosis. In general, most cases require no treatment, but cytotoxic agents or rituximab can be used to treat more severe cases. Appropriate treatment for infectious causes of CAD includes supportive care aimed at the underlying disease process. In addition, it is helpful to keep the patient warm. There is no role for steroid therapy in CAD unlike in warm AIHA. However, our patient was symptomatic from her pneumonia, so we added steroids to help with her pulmonary insult.

The patient had a cold agglutinin titer of 1:256. Titers of 1:32 or higher are considered elevated by this technique. Elevated titers are generally rarely seen except in primary atypical pneumonia due to either M. pneumoniae, influenza A, influenza B, parainfluenza, and adenovirus, and in certain hemolytic anemias. Low titers of cold agglutinins have been demonstrated in malaria, peripheral vascular disease, and common respiratory diseases.

Warm AIHA is caused by IgG antibody activities at body temperature or at 98.6°F. They may or may not bind complement and are removed from circulation by the spleen. Cold AIHA is due to IgM antibodies coating red cells at lower temperatures. They bind complement and lead to red blood cell destruction of agglutinated cells. If the antibody is active at temperatures approaching 98.6°F, clinically significant intravascular and sometimes extravascular complement-mediated hemolysis occur in the liver.⁵

The incidence of warm AIHA occurs about 10 per 1 million people and affects women twice often as men.² It can be primary or idiopathic, or associated with various underlying conditions, including autoimmune disorders, immunodeficiency syndromes, lymphoproliferative disorders, other malignancies, and certain drugs. In more severe cases, jaundice and splenomegaly may occur. The blood smear in warm AIHA demonstrates variable spherocytosis, polychromasia, and rare erythrophagocytosis. Treatment usually includes steroids, cytotoxic agents, and splenectomy in severe cases.

There have been few case reports describing influenza as a cause of cold agglutinin hemolytic anemia. Chen and colleagues reported a case of influenza A infection in a 22-month-old boy.⁶Schoindre and colleagues reported the case of a 60-year-old woman infected with influenza A H1N1 virus who died from CAD.⁷ Shizuma reported the case of a 67-year-old man with alcoholic cirrhosis who developed a mixed hemolytic anemia and was positive for influenza A.⁸Our patient presented with influenza A, which had been diagnosed by respiratory virus panel at a different hospital, and she was anemic at the time of presentation to the outside hospital, with a positive DAT test. She was treated for influenza A with a full course of osltamivir and then returned with complaints of worsening fatigue and was again noted to be anemic with the development of patchy opacities on chest X-ray. The patient was subsequently transferred to our hospital and remained anemic during the course of her treatment. She received supportive care for her underlying influenza A and had symptomatic improvement. She ultimately decided the she would like to pursue further treatment in her native country and was discharged.

In conclusion, this case represents a rare complication of a common illness. Few cases of influenza causing hemolytic anemia have been reported in the literature. There have been reports of oseltamivir causing hemolytic anemia, but our patient presented with evidence of hemolytic anemia before initiation of the medication. In all the aforementioned cases, the patients died as a result of comorbid conditions. Our patient was stable enough to be discharged from the hospital after treatment of her comorbid conditions.

Acknowledgment
The authors thank David Henry, MD, at Pennsylvania Hospital, Philadelphia, for sharing this case and for his guidance during this patient’s treatment.

Autoimmune hemolytic anemia (AIHA) is characterized by the temperature at which the auto-antibody has the greatest avidity for the target red cell antigen, either warm or cold forms. It is detected by a positive direct antiglobulin test (DAT) also known as the direct Coombs test. DAT is used to determine if red cells have been coated in vivo with immunoglobulin, complement, or both.¹ Some causes of a positive DAT include hemolytic transfusion reactions, hemolytic disease of the fetus and newborn, AIHA, and drug-induced immune hemolysis.

Case presentation and summary

A 58-year-old woman from Brazil with past medical history only significant for cholecystectomy and cesarean section had been visiting in United States for 2 months when she presented to an outside hospital with fever, shortness of breath, and syncope that had resulted in a foot injury. She reported she had been feeling short of breath and had a nonproductive cough and malaise for about 2 weeks before presentation with sick contacts at home. On admission it was noted that she had a hemoglobin level of 7.7 g/dL (normal, 12.0-15.5 g/dL; MCV, 94 fL), total bilirubin of 2.14 mg/dL (normal, 0.2-1.0 mg/dL), and lactate dehydrogenase of 523 U/L (normal, 81-234 U/L). There were no signs of bleeding on her examination. Her DAT was positive and moderate red blood cell agglutination was reported. During the first admission at the outside hospital she was diagnosed with influenza A and completed a full course of oseltamivir (75 mg po twice daily for 5 days). A chest X-ray was negative for infiltrates and showed that the patient’s lung fields were clear. She was transfused 2 units of packed red blood cells with response in hemoglobin up to 9.8 g/dL. The patient was treated with dexamethasone (4 mg IV Q8) as an inpatient and was discharged on a prednisone taper (40 mg, with taper by 10 mg every 3 days) with hemoglobin of 8.1 g/dL.

The patient continued to have nonproductive cough, dyspnea, fevers, chills, and generalized weakness, when she returned to the same outside hospital’s emergency department 2 days after her discharge. At that time, it was noted that she had leucocytosis (white blood cell count, 34.6 x 10⁹ per L), a hemoglobin level of 6.8 g/dL, and her total bilirubin level was 6.9 mg/dL. Her hemodynamics were unstable and she was admitted to their intensive care unit. The results of a chest X-ray revealed right lung consolidation.

The day after this admission, her hemoglobin level fell to 4.7 g/dL, and she was transfused 2 units of packed red blood cells before being transferred to our hospital. A chest X-ray at our hospital confirmed a right lung infiltrate. Vancomycin (1,250 mg IV Q12), levaquin (750 mg IV Q24), and maxipime (1 g IV Q12) were initiated for pneumonia and the patient was transferred to our hospital’s intensive care unit. She was afebrile at 98.3°F, her pulse rate was 84 beats per minute, she was tachypneic with respiratory rate of 26 breaths per minute, her blood pressure was 98/51 mmHg, and she had an oxygen saturation of 99% on 2L oxygen via nasal cannula.

On physical examination she was noted to have scleral icterus and was in mild respiratory distress. A chest X-ray revealed a patchy opacity in the right mid to lower lung. Her initial complete blood panel revealed anemia, with hemoglobin, 6.3 g/dL; white blood cell count, 27 x 10⁹ per L; and platelets, 533 x 10⁹ per L. The patient was then transfused another 2 units of packed red blood cells. She was given intravenous hydration, acetaminophen, and albuterol nebulizer treatments as supportive care. She was provided with blankets to keep warm. In addition to her antibiotics, she was also given prednisone 70 mg for her respiratory symptoms.

Further tests revealed haptoglobin, <30 mg/dL (normal, 36-195 mg/dL); lactate dehydrogenase, 371 U/L (normal, 98-192 U/L); and complements C3, 90 mg/dL (normal, 79-152 mg/dL) and C4, <8 mg/dL (normal, 18-55 mg/dL). Her DAT was positive, and agglutination was seen on peripheral smear (Figure 1). This was her second positive DAT as she had positive one at the outside hospital initially. Her tests for mycoplasma pneumonia, the PCR and IgM, were negative, as were the Monospot for mononucleosis and the ANA for autoimmune disorders. Her cold agglutinin titer was 1:256 (normal, no agglutination <1:64). The patient’s repeat respiratory viral panel was negative given recent full treatment for her influenza A at the previous hospital. Her blood and urine cultures were negative.

Figures 2 and 3 illustrate her hemoglobin and reticulocyte trend during her admission at our hospital.

Discussion

The incidence of cold AIHA or cold agglutinin disease (CAD) occurs about 4 per 1 million people and commonly affects women more often than men.² The cause of CAD can be subdivided into primary, idiopathic, or secondary causes, which can include infections, malignancies, or benign diseases.^3,4 Primary CAD is a chronic disorder that is generally seen in older women. Secondary CAD can be associated with B-cell lymphoproliferative disorders, such as Waldenstrom macroglobulinemia or chronic lymphocytic leukemia, and infectious agents such as Mycoplasma pneumoniae and mononucleosis caused by Epstein-Barr virus.

Mild hemolysis or acrocyanosis may occur with exposure to cold. The blood smear in CAD demonstrates red blood cell agglutination or clumping, polychromasia, and an absence of spherocytosis. In general, most cases require no treatment, but cytotoxic agents or rituximab can be used to treat more severe cases. Appropriate treatment for infectious causes of CAD includes supportive care aimed at the underlying disease process. In addition, it is helpful to keep the patient warm. There is no role for steroid therapy in CAD unlike in warm AIHA. However, our patient was symptomatic from her pneumonia, so we added steroids to help with her pulmonary insult.

The patient had a cold agglutinin titer of 1:256. Titers of 1:32 or higher are considered elevated by this technique. Elevated titers are generally rarely seen except in primary atypical pneumonia due to either M. pneumoniae, influenza A, influenza B, parainfluenza, and adenovirus, and in certain hemolytic anemias. Low titers of cold agglutinins have been demonstrated in malaria, peripheral vascular disease, and common respiratory diseases.

Warm AIHA is caused by IgG antibody activities at body temperature or at 98.6°F. They may or may not bind complement and are removed from circulation by the spleen. Cold AIHA is due to IgM antibodies coating red cells at lower temperatures. They bind complement and lead to red blood cell destruction of agglutinated cells. If the antibody is active at temperatures approaching 98.6°F, clinically significant intravascular and sometimes extravascular complement-mediated hemolysis occur in the liver.⁵

The incidence of warm AIHA occurs about 10 per 1 million people and affects women twice often as men.² It can be primary or idiopathic, or associated with various underlying conditions, including autoimmune disorders, immunodeficiency syndromes, lymphoproliferative disorders, other malignancies, and certain drugs. In more severe cases, jaundice and splenomegaly may occur. The blood smear in warm AIHA demonstrates variable spherocytosis, polychromasia, and rare erythrophagocytosis. Treatment usually includes steroids, cytotoxic agents, and splenectomy in severe cases.

There have been few case reports describing influenza as a cause of cold agglutinin hemolytic anemia. Chen and colleagues reported a case of influenza A infection in a 22-month-old boy.⁶Schoindre and colleagues reported the case of a 60-year-old woman infected with influenza A H1N1 virus who died from CAD.⁷ Shizuma reported the case of a 67-year-old man with alcoholic cirrhosis who developed a mixed hemolytic anemia and was positive for influenza A.⁸Our patient presented with influenza A, which had been diagnosed by respiratory virus panel at a different hospital, and she was anemic at the time of presentation to the outside hospital, with a positive DAT test. She was treated for influenza A with a full course of osltamivir and then returned with complaints of worsening fatigue and was again noted to be anemic with the development of patchy opacities on chest X-ray. The patient was subsequently transferred to our hospital and remained anemic during the course of her treatment. She received supportive care for her underlying influenza A and had symptomatic improvement. She ultimately decided the she would like to pursue further treatment in her native country and was discharged.

In conclusion, this case represents a rare complication of a common illness. Few cases of influenza causing hemolytic anemia have been reported in the literature. There have been reports of oseltamivir causing hemolytic anemia, but our patient presented with evidence of hemolytic anemia before initiation of the medication. In all the aforementioned cases, the patients died as a result of comorbid conditions. Our patient was stable enough to be discharged from the hospital after treatment of her comorbid conditions.

Acknowledgment
The authors thank David Henry, MD, at Pennsylvania Hospital, Philadelphia, for sharing this case and for his guidance during this patient’s treatment.

Case

A 96-year-old woman with a medical history of sciatica, vertigo, osteoporosis, and dementia presented with atraumatic right leg pain. She stated that the pain, which began 4 weeks prior to presentation, started in her right groin. The patient’s primary care physician diagnosed her with tendonitis, and prescribed acetaminophen/codeine and naproxen sodium for the pain. However, the patient’s pain progressively worsened to the point where she was no longer able to ambulate or bear weight on her right hip, prompting this visit to the ED.

On physical examination, the patient’s right hip was tender to palpation without any signs of physical deformity of the lower extremity. Upon hip flexion, she grimaced and communicated her pain.

Radiographs and computed tomography images taken of the right hip, femur, and pelvis demonstrated low-bone mineral density without fracture.

What is the diagnosis?

Answer

Axial and coronal edema-sensitive images of the pelvis demonstrated edema (increased signal) within the right psoas, iliacus, and iliopsoas muscles (red arrows, Figures 2a-2c), which were in contrast to the normal pelvic muscles on the left side (white arrows, Figures 2a-2c).

Iliopsoas Musculotendinous Unit

The iliopsoas musculotendinous unit consists of the psoas major, the psoas minor, and the iliacus, with the psoas minor absent in 40% to 50% of cases.^1,2 The iliacus muscle arises from the iliac wing and inserts with the psoas tendon onto the lesser trochanter of the femur. These muscles function as primary flexors of the thigh and trunk, as well as lateral flexors of the lower vertebral column.²

Signs and Symptoms

In non-sports-related injuries, iliopsoas tendon tears typically occur in elderly female patients—even in the absence of any trauma or known predisposing factors. Patients with iliopsoas tears typically present with hip or groin pain, and weakness with hip flexion, which clinically may mimic hip or sacral fracture. An anterior thigh mass or ecchymosis may also be present. Complete tear of the iliopsoas tendon usually occurs at or near the distal insertion at the lesser trochanter, and is often associated with proximal retraction of the tendon to the level of the femoral head.¹

Imaging Studies

Iliopsoas tendon injury is best evaluated with MRI, particularly with fluid-sensitive sequences. Patients with iliopsoas tendon tears have abnormal signal in the muscle belly, likely related to edema and hemorrhage, and hematoma or fluid around the torn tendon and at the site of retraction. In pediatric patients, iliopsoas injury is typically an avulsion of the lesser trochanter prior to fusion of the apophysis.^3,4 In adult patients with avulsion of the lesser trochanter, this injury is regarded as a sign of metastatic disease until proven otherwise.⁵

Treatment

Patients with iliopsoas tendon rupture are treated conservatively with rest, ice, and physical therapy (PT). Preservation of the distal muscular insertion of the lateral portion of the iliacus muscle is thought to play a role in positive clinical outcomes.³

The patient in this case was admitted to the hospital and treated for pain with standing acetaminophen, tramadol as needed, and a lidocaine patch. After attending multiple inpatient PT sessions, she was discharged to a subacute rehabilitation facility.

Case

A 96-year-old woman with a medical history of sciatica, vertigo, osteoporosis, and dementia presented with atraumatic right leg pain. She stated that the pain, which began 4 weeks prior to presentation, started in her right groin. The patient’s primary care physician diagnosed her with tendonitis, and prescribed acetaminophen/codeine and naproxen sodium for the pain. However, the patient’s pain progressively worsened to the point where she was no longer able to ambulate or bear weight on her right hip, prompting this visit to the ED.

On physical examination, the patient’s right hip was tender to palpation without any signs of physical deformity of the lower extremity. Upon hip flexion, she grimaced and communicated her pain.

Radiographs and computed tomography images taken of the right hip, femur, and pelvis demonstrated low-bone mineral density without fracture.

What is the diagnosis?

Answer

Axial and coronal edema-sensitive images of the pelvis demonstrated edema (increased signal) within the right psoas, iliacus, and iliopsoas muscles (red arrows, Figures 2a-2c), which were in contrast to the normal pelvic muscles on the left side (white arrows, Figures 2a-2c).

Iliopsoas Musculotendinous Unit

The iliopsoas musculotendinous unit consists of the psoas major, the psoas minor, and the iliacus, with the psoas minor absent in 40% to 50% of cases.^1,2 The iliacus muscle arises from the iliac wing and inserts with the psoas tendon onto the lesser trochanter of the femur. These muscles function as primary flexors of the thigh and trunk, as well as lateral flexors of the lower vertebral column.²

Signs and Symptoms

In non-sports-related injuries, iliopsoas tendon tears typically occur in elderly female patients—even in the absence of any trauma or known predisposing factors. Patients with iliopsoas tears typically present with hip or groin pain, and weakness with hip flexion, which clinically may mimic hip or sacral fracture. An anterior thigh mass or ecchymosis may also be present. Complete tear of the iliopsoas tendon usually occurs at or near the distal insertion at the lesser trochanter, and is often associated with proximal retraction of the tendon to the level of the femoral head.¹

Imaging Studies

Iliopsoas tendon injury is best evaluated with MRI, particularly with fluid-sensitive sequences. Patients with iliopsoas tendon tears have abnormal signal in the muscle belly, likely related to edema and hemorrhage, and hematoma or fluid around the torn tendon and at the site of retraction. In pediatric patients, iliopsoas injury is typically an avulsion of the lesser trochanter prior to fusion of the apophysis.^3,4 In adult patients with avulsion of the lesser trochanter, this injury is regarded as a sign of metastatic disease until proven otherwise.⁵

Treatment

Patients with iliopsoas tendon rupture are treated conservatively with rest, ice, and physical therapy (PT). Preservation of the distal muscular insertion of the lateral portion of the iliacus muscle is thought to play a role in positive clinical outcomes.³

The patient in this case was admitted to the hospital and treated for pain with standing acetaminophen, tramadol as needed, and a lidocaine patch. After attending multiple inpatient PT sessions, she was discharged to a subacute rehabilitation facility.

Case

A 96-year-old woman with a medical history of sciatica, vertigo, osteoporosis, and dementia presented with atraumatic right leg pain. She stated that the pain, which began 4 weeks prior to presentation, started in her right groin. The patient’s primary care physician diagnosed her with tendonitis, and prescribed acetaminophen/codeine and naproxen sodium for the pain. However, the patient’s pain progressively worsened to the point where she was no longer able to ambulate or bear weight on her right hip, prompting this visit to the ED.

On physical examination, the patient’s right hip was tender to palpation without any signs of physical deformity of the lower extremity. Upon hip flexion, she grimaced and communicated her pain.

Radiographs and computed tomography images taken of the right hip, femur, and pelvis demonstrated low-bone mineral density without fracture.

What is the diagnosis?

Answer

Axial and coronal edema-sensitive images of the pelvis demonstrated edema (increased signal) within the right psoas, iliacus, and iliopsoas muscles (red arrows, Figures 2a-2c), which were in contrast to the normal pelvic muscles on the left side (white arrows, Figures 2a-2c).

Iliopsoas Musculotendinous Unit

The iliopsoas musculotendinous unit consists of the psoas major, the psoas minor, and the iliacus, with the psoas minor absent in 40% to 50% of cases.^1,2 The iliacus muscle arises from the iliac wing and inserts with the psoas tendon onto the lesser trochanter of the femur. These muscles function as primary flexors of the thigh and trunk, as well as lateral flexors of the lower vertebral column.²

Signs and Symptoms

In non-sports-related injuries, iliopsoas tendon tears typically occur in elderly female patients—even in the absence of any trauma or known predisposing factors. Patients with iliopsoas tears typically present with hip or groin pain, and weakness with hip flexion, which clinically may mimic hip or sacral fracture. An anterior thigh mass or ecchymosis may also be present. Complete tear of the iliopsoas tendon usually occurs at or near the distal insertion at the lesser trochanter, and is often associated with proximal retraction of the tendon to the level of the femoral head.¹

Imaging Studies

Iliopsoas tendon injury is best evaluated with MRI, particularly with fluid-sensitive sequences. Patients with iliopsoas tendon tears have abnormal signal in the muscle belly, likely related to edema and hemorrhage, and hematoma or fluid around the torn tendon and at the site of retraction. In pediatric patients, iliopsoas injury is typically an avulsion of the lesser trochanter prior to fusion of the apophysis.^3,4 In adult patients with avulsion of the lesser trochanter, this injury is regarded as a sign of metastatic disease until proven otherwise.⁵

Treatment

Patients with iliopsoas tendon rupture are treated conservatively with rest, ice, and physical therapy (PT). Preservation of the distal muscular insertion of the lateral portion of the iliacus muscle is thought to play a role in positive clinical outcomes.³

The patient in this case was admitted to the hospital and treated for pain with standing acetaminophen, tramadol as needed, and a lidocaine patch. After attending multiple inpatient PT sessions, she was discharged to a subacute rehabilitation facility.

Case

A woman in her third decade with no known medical history was dropped off at the waiting area of the ED for evaluation of depressed mental status. Upon arrival, the patient was unresponsive and cyanotic, with a pulse oximetry of 65% on room air. Bag-valve mask (BVM) ventilation rapidly improved oxygen saturation to 90%. The patient’s other vital signs were: heart rate, 141 beats/min; blood pressure (BP), 117/65 mm Hg; and temperature, afebrile.

Upon examination, the patient’s pupils were pinpoint and her ventilatory effort was shallow, leading the emergency physician (EP) to suspect the patient’s depressed mental status was due to an opioid overdose.

The patient was given 2 mg of intravenous (IV) naloxone, after which she became more alert and responsive, with improved respiratory effort. After receiving naloxone, the patient vomited copiously. Pulmonary examination revealed diffuse rales, most prominently at the right lung base, and a cough productive of thick sputum.

During the patient’s course in the ED, she became increasingly hypotensive with systolic BP readings around 70 mm Hg; tachycardia, fluctuating at around 120 beats/min; and persistent hypoxia of 90% saturation on a nonrebreather mask. A chest X-ray demonstrated pulmonary edema with a continuous diaphragm sign suggesting pneumomediastinum. A computed tomography (CT) scan of the chest confirmed pulmonary edema with extensive pneumomediastinum, and the patient was admitted to the intensive care unit (ICU).

What is naloxone and why is it used?

Naloxone is a nonselective, short-acting, pure opioid antagonist that works at the mu, kappa, and sigma receptors, with the highest affinity for the mu receptor. It is a competitive opioid receptor antagonist that has an elimination half-life of approximately 30 minutes. Though naloxone was originally developed to reverse the effects of anesthesia postoperatively,¹ today it is more commonly used to treat ventilatory depression in patients whose clinical findings are most likely due to an opioid overdose.

What is acute opioid withdrawal syndrome?

Opioid-dependent individuals who abstain from use for more than a few hours generally develop opioid withdrawal syndrome (OWS). The effects of OWS include mild-to-moderate tachycardia and hypertension, nausea, vomiting, piloerection, rhinorrhea, and agitated behavior. However, when opioid-dependent patients receive naloxone, OWS develops at a much faster rate (ie, seconds after naloxone administration) and is often more severe.

Findings of naloxone-precipitated OWS include pronounced vital sign abnormalities, seizures,pulmonary edema, and cardiac arrhythmias such as ventricular tachycardia.² These latter findings are primarily due to the sudden release of catecholamines.³ In addition, patients suffer the psychological pangs of withdrawal, including dysphoria and drug craving, which often leads to poor decision-making as they search for additional opioids to alleviate these troubling effects.

What determines response to naloxone and development of OWS?

The severity of precipitated OWS following naloxone administration is determined by both the degree of the patient’s opioid dependency and the dosage and rate at which naloxone is given. The depth of opioid dependence is determined to a large extent by the quantity of opioid regularly used and the frequency of exposure. For example, a patient who takes 30 mg of oxycodone daily will likely demonstrate mild OWS, while one who uses 300 mg daily will demonstrate more severe OWS—whether due to abstinence or naloxone.

In addition, longer exposure time of the patient’s brain to opioids increases the dependency level. Continuous use of extended-release opioids or methadone, which are both of long duration, essentially “bathe” the brain receptors in opioid around the clock, whereas short-acting opioids, such as fentanyl or heroin, cause peaks and troughs in brain concentrations throughout the day. These trough periods reduce dependency, but increase the abuse liability of the opioid. Patients who only use opioids on the weekend, for example, will have minimal or no OWS following naloxone administration, nor will the toddler with an exploratory ingestion of an opioid medication found in the home. It is therefore important to gauge the extent of a patient’s opioid use to improve the safe use of naloxone in the ED.

What is the optimal dosing of naloxone and proper patient management?

It is essential for clinicians to remember that the ultimate goal of naloxone administration in the ED is to reverse ventilatory depression—not to restore a patient to a normal mental status.⁴ In fact, full awakening, in addition to precipitating OWS, may lead to difficult interpersonal situations in the ED, since such patients often insist on leaving the ED before the effects of naloxone wear off. This situation places the EP in the undesirable position of discharging a patient who may predictably relapse—though unlikely to die—after release.⁵

Management in the Hospital Setting. Given the advanced medical care environment in a hospital, the approach to opioid overdose patients can be metered. This means providing temporary noninvasive mechanical ventilatory support through BVM or laryngeal mask airways, which allow both oxygenation and ventilation (reducing the patient’s partial pressure of carbon dioxide), prior to giving naloxone.⁶ Studies on animal models have shown that lowering the partial pressure of carbon dioxide reduces the catecholamine response to naloxone.⁷

Although recent literature and textbook recommendations regarding naloxone dosages vary,¹ the safest initial dose of naloxone in the hospital setting is 0.04 mg (40 mcg) IV, or 0.08 mg (80 mcg) intramuscularly (IM).⁸ Whether given by IV or IM route, frequent reassessment of the adequacy of spontaneous ventilatory effort and oxygenation are required.

While the rate of opioid reversal is slower when giving lower doses of naloxone, this approach reduces the severity of precipitated OWS. In fact, in most patients who receive low-dose naloxone administration will not awaken but will develop life-sustaining spontaneous ventilation.⁸

By monitoring of the patient’s ventilatory rate and depth, along with capnometry and pulse oximetry (without providing exogenous oxygen), the EP can identify the need for additional naloxone. Since the half-life of naloxone is shorter than that of many opioids, proper ventilatory monitoring is essential to assess for the waning of naloxone’s effects and return of respiratory depression.

Treatment in the Nonhospital Setting. Emergency medical service (EMS) workers typically, and often by situational necessity, approach opioid overdose patients more aggressively than do EPs in the ED. Although some EMS systems utilize the IV route, most EMS workers, like laypersons, administer an initial naloxone dose of 0.4 mg IM or 2 or 4 mg intranasally (IN). Due to the slower rate of absorption and lower bioavailability (with IN administration), both IM and IN naloxone equate to roughly 0.08 mg IV.

For patients in whom there is no risk for opioid dependence, the initial dose of naloxone is relatively inconsequential, and higher doses can be safely administered. However, for most patients, including those in the ED setting, in whom one cannot be certain of their depth of dependence, the safest approach is to “start low and go slow” with naloxone administration, while providing supportive care.

Case Conclusion

The patient was not opioid-naïve, explaining the catecholamine surge and related cardiovascular dysfunction and pulmonary edema. The pneumomediastinum and pulmonary aspiration were due to the violent retching and vomiting. After being admitted to the ICU, the patient was started on vancomycin and piperacillin/tazobactam for empiric coverage for mediastinal emphysema. She was kept NPO, assessed by cardiothoracic surgery, and treated with gentle fluid hydration.

A repeat CT showed a stable pneumomediastinum. Her hypoxia, tachycardia, and hypotension gradually improved over about 6 hours. The following day, the patient’s mental status normalized, and she discharged herself from the hospital against medical advice.

Case

A woman in her third decade with no known medical history was dropped off at the waiting area of the ED for evaluation of depressed mental status. Upon arrival, the patient was unresponsive and cyanotic, with a pulse oximetry of 65% on room air. Bag-valve mask (BVM) ventilation rapidly improved oxygen saturation to 90%. The patient’s other vital signs were: heart rate, 141 beats/min; blood pressure (BP), 117/65 mm Hg; and temperature, afebrile.

Upon examination, the patient’s pupils were pinpoint and her ventilatory effort was shallow, leading the emergency physician (EP) to suspect the patient’s depressed mental status was due to an opioid overdose.

The patient was given 2 mg of intravenous (IV) naloxone, after which she became more alert and responsive, with improved respiratory effort. After receiving naloxone, the patient vomited copiously. Pulmonary examination revealed diffuse rales, most prominently at the right lung base, and a cough productive of thick sputum.

During the patient’s course in the ED, she became increasingly hypotensive with systolic BP readings around 70 mm Hg; tachycardia, fluctuating at around 120 beats/min; and persistent hypoxia of 90% saturation on a nonrebreather mask. A chest X-ray demonstrated pulmonary edema with a continuous diaphragm sign suggesting pneumomediastinum. A computed tomography (CT) scan of the chest confirmed pulmonary edema with extensive pneumomediastinum, and the patient was admitted to the intensive care unit (ICU).

What is naloxone and why is it used?

Naloxone is a nonselective, short-acting, pure opioid antagonist that works at the mu, kappa, and sigma receptors, with the highest affinity for the mu receptor. It is a competitive opioid receptor antagonist that has an elimination half-life of approximately 30 minutes. Though naloxone was originally developed to reverse the effects of anesthesia postoperatively,¹ today it is more commonly used to treat ventilatory depression in patients whose clinical findings are most likely due to an opioid overdose.

What is acute opioid withdrawal syndrome?

Opioid-dependent individuals who abstain from use for more than a few hours generally develop opioid withdrawal syndrome (OWS). The effects of OWS include mild-to-moderate tachycardia and hypertension, nausea, vomiting, piloerection, rhinorrhea, and agitated behavior. However, when opioid-dependent patients receive naloxone, OWS develops at a much faster rate (ie, seconds after naloxone administration) and is often more severe.

Findings of naloxone-precipitated OWS include pronounced vital sign abnormalities, seizures,pulmonary edema, and cardiac arrhythmias such as ventricular tachycardia.² These latter findings are primarily due to the sudden release of catecholamines.³ In addition, patients suffer the psychological pangs of withdrawal, including dysphoria and drug craving, which often leads to poor decision-making as they search for additional opioids to alleviate these troubling effects.

What determines response to naloxone and development of OWS?

The severity of precipitated OWS following naloxone administration is determined by both the degree of the patient’s opioid dependency and the dosage and rate at which naloxone is given. The depth of opioid dependence is determined to a large extent by the quantity of opioid regularly used and the frequency of exposure. For example, a patient who takes 30 mg of oxycodone daily will likely demonstrate mild OWS, while one who uses 300 mg daily will demonstrate more severe OWS—whether due to abstinence or naloxone.

In addition, longer exposure time of the patient’s brain to opioids increases the dependency level. Continuous use of extended-release opioids or methadone, which are both of long duration, essentially “bathe” the brain receptors in opioid around the clock, whereas short-acting opioids, such as fentanyl or heroin, cause peaks and troughs in brain concentrations throughout the day. These trough periods reduce dependency, but increase the abuse liability of the opioid. Patients who only use opioids on the weekend, for example, will have minimal or no OWS following naloxone administration, nor will the toddler with an exploratory ingestion of an opioid medication found in the home. It is therefore important to gauge the extent of a patient’s opioid use to improve the safe use of naloxone in the ED.

What is the optimal dosing of naloxone and proper patient management?

It is essential for clinicians to remember that the ultimate goal of naloxone administration in the ED is to reverse ventilatory depression—not to restore a patient to a normal mental status.⁴ In fact, full awakening, in addition to precipitating OWS, may lead to difficult interpersonal situations in the ED, since such patients often insist on leaving the ED before the effects of naloxone wear off. This situation places the EP in the undesirable position of discharging a patient who may predictably relapse—though unlikely to die—after release.⁵

Management in the Hospital Setting. Given the advanced medical care environment in a hospital, the approach to opioid overdose patients can be metered. This means providing temporary noninvasive mechanical ventilatory support through BVM or laryngeal mask airways, which allow both oxygenation and ventilation (reducing the patient’s partial pressure of carbon dioxide), prior to giving naloxone.⁶ Studies on animal models have shown that lowering the partial pressure of carbon dioxide reduces the catecholamine response to naloxone.⁷

Although recent literature and textbook recommendations regarding naloxone dosages vary,¹ the safest initial dose of naloxone in the hospital setting is 0.04 mg (40 mcg) IV, or 0.08 mg (80 mcg) intramuscularly (IM).⁸ Whether given by IV or IM route, frequent reassessment of the adequacy of spontaneous ventilatory effort and oxygenation are required.

While the rate of opioid reversal is slower when giving lower doses of naloxone, this approach reduces the severity of precipitated OWS. In fact, in most patients who receive low-dose naloxone administration will not awaken but will develop life-sustaining spontaneous ventilation.⁸

By monitoring of the patient’s ventilatory rate and depth, along with capnometry and pulse oximetry (without providing exogenous oxygen), the EP can identify the need for additional naloxone. Since the half-life of naloxone is shorter than that of many opioids, proper ventilatory monitoring is essential to assess for the waning of naloxone’s effects and return of respiratory depression.

Treatment in the Nonhospital Setting. Emergency medical service (EMS) workers typically, and often by situational necessity, approach opioid overdose patients more aggressively than do EPs in the ED. Although some EMS systems utilize the IV route, most EMS workers, like laypersons, administer an initial naloxone dose of 0.4 mg IM or 2 or 4 mg intranasally (IN). Due to the slower rate of absorption and lower bioavailability (with IN administration), both IM and IN naloxone equate to roughly 0.08 mg IV.

For patients in whom there is no risk for opioid dependence, the initial dose of naloxone is relatively inconsequential, and higher doses can be safely administered. However, for most patients, including those in the ED setting, in whom one cannot be certain of their depth of dependence, the safest approach is to “start low and go slow” with naloxone administration, while providing supportive care.

Case Conclusion

The patient was not opioid-naïve, explaining the catecholamine surge and related cardiovascular dysfunction and pulmonary edema. The pneumomediastinum and pulmonary aspiration were due to the violent retching and vomiting. After being admitted to the ICU, the patient was started on vancomycin and piperacillin/tazobactam for empiric coverage for mediastinal emphysema. She was kept NPO, assessed by cardiothoracic surgery, and treated with gentle fluid hydration.

A repeat CT showed a stable pneumomediastinum. Her hypoxia, tachycardia, and hypotension gradually improved over about 6 hours. The following day, the patient’s mental status normalized, and she discharged herself from the hospital against medical advice.

Case

A woman in her third decade with no known medical history was dropped off at the waiting area of the ED for evaluation of depressed mental status. Upon arrival, the patient was unresponsive and cyanotic, with a pulse oximetry of 65% on room air. Bag-valve mask (BVM) ventilation rapidly improved oxygen saturation to 90%. The patient’s other vital signs were: heart rate, 141 beats/min; blood pressure (BP), 117/65 mm Hg; and temperature, afebrile.

Upon examination, the patient’s pupils were pinpoint and her ventilatory effort was shallow, leading the emergency physician (EP) to suspect the patient’s depressed mental status was due to an opioid overdose.

The patient was given 2 mg of intravenous (IV) naloxone, after which she became more alert and responsive, with improved respiratory effort. After receiving naloxone, the patient vomited copiously. Pulmonary examination revealed diffuse rales, most prominently at the right lung base, and a cough productive of thick sputum.

During the patient’s course in the ED, she became increasingly hypotensive with systolic BP readings around 70 mm Hg; tachycardia, fluctuating at around 120 beats/min; and persistent hypoxia of 90% saturation on a nonrebreather mask. A chest X-ray demonstrated pulmonary edema with a continuous diaphragm sign suggesting pneumomediastinum. A computed tomography (CT) scan of the chest confirmed pulmonary edema with extensive pneumomediastinum, and the patient was admitted to the intensive care unit (ICU).

What is naloxone and why is it used?

Naloxone is a nonselective, short-acting, pure opioid antagonist that works at the mu, kappa, and sigma receptors, with the highest affinity for the mu receptor. It is a competitive opioid receptor antagonist that has an elimination half-life of approximately 30 minutes. Though naloxone was originally developed to reverse the effects of anesthesia postoperatively,¹ today it is more commonly used to treat ventilatory depression in patients whose clinical findings are most likely due to an opioid overdose.

What is acute opioid withdrawal syndrome?

Opioid-dependent individuals who abstain from use for more than a few hours generally develop opioid withdrawal syndrome (OWS). The effects of OWS include mild-to-moderate tachycardia and hypertension, nausea, vomiting, piloerection, rhinorrhea, and agitated behavior. However, when opioid-dependent patients receive naloxone, OWS develops at a much faster rate (ie, seconds after naloxone administration) and is often more severe.

Findings of naloxone-precipitated OWS include pronounced vital sign abnormalities, seizures,pulmonary edema, and cardiac arrhythmias such as ventricular tachycardia.² These latter findings are primarily due to the sudden release of catecholamines.³ In addition, patients suffer the psychological pangs of withdrawal, including dysphoria and drug craving, which often leads to poor decision-making as they search for additional opioids to alleviate these troubling effects.

What determines response to naloxone and development of OWS?

The severity of precipitated OWS following naloxone administration is determined by both the degree of the patient’s opioid dependency and the dosage and rate at which naloxone is given. The depth of opioid dependence is determined to a large extent by the quantity of opioid regularly used and the frequency of exposure. For example, a patient who takes 30 mg of oxycodone daily will likely demonstrate mild OWS, while one who uses 300 mg daily will demonstrate more severe OWS—whether due to abstinence or naloxone.

In addition, longer exposure time of the patient’s brain to opioids increases the dependency level. Continuous use of extended-release opioids or methadone, which are both of long duration, essentially “bathe” the brain receptors in opioid around the clock, whereas short-acting opioids, such as fentanyl or heroin, cause peaks and troughs in brain concentrations throughout the day. These trough periods reduce dependency, but increase the abuse liability of the opioid. Patients who only use opioids on the weekend, for example, will have minimal or no OWS following naloxone administration, nor will the toddler with an exploratory ingestion of an opioid medication found in the home. It is therefore important to gauge the extent of a patient’s opioid use to improve the safe use of naloxone in the ED.

What is the optimal dosing of naloxone and proper patient management?

It is essential for clinicians to remember that the ultimate goal of naloxone administration in the ED is to reverse ventilatory depression—not to restore a patient to a normal mental status.⁴ In fact, full awakening, in addition to precipitating OWS, may lead to difficult interpersonal situations in the ED, since such patients often insist on leaving the ED before the effects of naloxone wear off. This situation places the EP in the undesirable position of discharging a patient who may predictably relapse—though unlikely to die—after release.⁵

Management in the Hospital Setting. Given the advanced medical care environment in a hospital, the approach to opioid overdose patients can be metered. This means providing temporary noninvasive mechanical ventilatory support through BVM or laryngeal mask airways, which allow both oxygenation and ventilation (reducing the patient’s partial pressure of carbon dioxide), prior to giving naloxone.⁶ Studies on animal models have shown that lowering the partial pressure of carbon dioxide reduces the catecholamine response to naloxone.⁷

Although recent literature and textbook recommendations regarding naloxone dosages vary,¹ the safest initial dose of naloxone in the hospital setting is 0.04 mg (40 mcg) IV, or 0.08 mg (80 mcg) intramuscularly (IM).⁸ Whether given by IV or IM route, frequent reassessment of the adequacy of spontaneous ventilatory effort and oxygenation are required.

While the rate of opioid reversal is slower when giving lower doses of naloxone, this approach reduces the severity of precipitated OWS. In fact, in most patients who receive low-dose naloxone administration will not awaken but will develop life-sustaining spontaneous ventilation.⁸

By monitoring of the patient’s ventilatory rate and depth, along with capnometry and pulse oximetry (without providing exogenous oxygen), the EP can identify the need for additional naloxone. Since the half-life of naloxone is shorter than that of many opioids, proper ventilatory monitoring is essential to assess for the waning of naloxone’s effects and return of respiratory depression.

Treatment in the Nonhospital Setting. Emergency medical service (EMS) workers typically, and often by situational necessity, approach opioid overdose patients more aggressively than do EPs in the ED. Although some EMS systems utilize the IV route, most EMS workers, like laypersons, administer an initial naloxone dose of 0.4 mg IM or 2 or 4 mg intranasally (IN). Due to the slower rate of absorption and lower bioavailability (with IN administration), both IM and IN naloxone equate to roughly 0.08 mg IV.

For patients in whom there is no risk for opioid dependence, the initial dose of naloxone is relatively inconsequential, and higher doses can be safely administered. However, for most patients, including those in the ED setting, in whom one cannot be certain of their depth of dependence, the safest approach is to “start low and go slow” with naloxone administration, while providing supportive care.

Case Conclusion

The patient was not opioid-naïve, explaining the catecholamine surge and related cardiovascular dysfunction and pulmonary edema. The pneumomediastinum and pulmonary aspiration were due to the violent retching and vomiting. After being admitted to the ICU, the patient was started on vancomycin and piperacillin/tazobactam for empiric coverage for mediastinal emphysema. She was kept NPO, assessed by cardiothoracic surgery, and treated with gentle fluid hydration.

A repeat CT showed a stable pneumomediastinum. Her hypoxia, tachycardia, and hypotension gradually improved over about 6 hours. The following day, the patient’s mental status normalized, and she discharged herself from the hospital against medical advice.

Take-Home Points

• PQ is easily mistaken for a PB tear.
• PQ is best identified on MRI, but commonly missed.
• For symptomatic cases, excision is the best treatment.
• Consider PQ in patients with chronic ankle pain, swelling, and/or instability.

The peroneus quartus (PQ) is an accessory muscle arising from the leg’s lateral compartment, which typically contains the peroneus longus (PL) and the peroneus brevis (PB). The many cadaveric studies that have been conducted indicate a general population prevalence ranging from 6.6% to 23%.¹ Radiographic studies, including magnetic resonance imaging (MRI) and ultrasonography, have shown a similar prevalence.² Although the PQ is asymptomatic in most cases, it may compromise the space of the superior peroneal tunnel and cause problems, including ankle pain, PB tear, subluxation of peroneal tendons, tendinous calcification, painful hypertrophy of retrotrochlear eminence, and recurrent hematomas.^1,3-5 Given its differing anatomy, the PQ variously has been referred to as peroneocalcaneus externum, peroneocuboideus, long peroneal tendon, and peroneoperoneolongus.¹ 

Although the PQ’s origin and insertion differ between subjects, the most common origin is the muscle fibers of the PB, and the most common insertion is the retrotrochlear eminence of the calcaneum.³

We report a case of peroneal tendon pathology that was initially thought to be caused primarily by impingement of a large osteochondroma on the tendons, but was later thought to be caused in part by a PQ and a split PB tendon seen only at the time of the second operation. The patient provided written informed consent for print and electronic publication of this case report.

Case Report

A 16-year-old boy with an osteochondroma of the right distal fibula presented to clinic with the chief complaint of lateral right ankle pain. A “sharp” pain accompanied by audible “popping” occurred with ankle motion. Medical history was significant only for non-Hodgkin lymphoma treated with bone marrow transplantation and whole body radiation at a young age. Physical examination revealed a palpable exostosis of the distal right fibula and associated ankle swelling.

One year after surgery, the patient returned with recurring right ankle pain and audible popping during ankle movement. There was no appreciable peroneal tendon subluxation on physical examination. Repeat imaging of the ankle showed no recurrence of the osteochondroma (Figure 2).

Discussion

Absence of a PQ muscle in simian and prosimian species suggests that the PQ represents an evolutionary adaptation to evert the lateral foot and improve bipedal gait. Although the 3 peroneal (PL, PB, peroneus tertius [PT]) muscles evert the middle part of the lateral border of the foot, the PQ inserts on the retrotrochlear eminence, which everts the posterior part of the lateral border of the foot.^1,6 The PQ has often been described as a variation of the PB. The PQ may also stabilize the ankle and reduce the energy required for walking. A similar functional adaptation has been proposed for the PT, which dorsiflexes at the ankle. Although presence of a PT also varies in the population, its occurrence does not correlate with presence of a PQ. In people with PQ muscles, there is an 83% to 95% incidence of also having PT muscles.⁷

PQ prevalence has ranged from 6.6% to 23% in cadaver studies² and from 7% to 17% in radiologic studies.¹ To better evaluate prevalence, Yammine² performed a meta-analysis of data from 46 studies (cadaveric dissection, MRI, ultrasonography) and 3928 legs and found an overall incidence of 10.2% and a higher incidence in the Indian population than in other races. Another study found no correlation between PQ presence and sex.⁷

MRI is the best imaging modality for assessing for PQ but must be performed specifically for this anatomical variation. Axial images may show a fat pad separating the PQ muscle from the PB muscle.⁸ On imaging, a PQ muscle can be mistaken for a peroneal tendon tear. A feature that helps in distinguishing the 2 is location; the PQ typically is found posterior and medial to the PL and PB tendons, whereas PB tears are anterior to the retromalleolar groove.² Presence of a PQ muscle may be missed on initial MRI, as occurred in our patient’s case. Zammit and Singh³ reviewed 80 leg MRIs and found 6 PQs. Only 1 of the 6 reports described the PQ as an “atypical appearance of peroneus brevis [that] appears to be made up of more than one tendon.”

Surgical excision is often adequate treatment for a symptomatic PQ. If the PQ muscle is small and symptomatic from pressure to the muscle mass, a short fasciotomy may be performed.⁹ More commonly, complete excision of the accessory muscle is required. Although the PQ muscle is usually asymptomatic, it should be considered in cases of chronic ankle pain, swelling, or instability; recurrent hematomas; and peroneal tendon subluxation or tears.^5,7

Our patient’s diagnosis was initially overlooked because of an osteochondroma in the region of interest. It remains unclear whether his pain was caused by the PQ itself or, more likely, from the PB tear. It is thought that the accessory muscle adds bulk to the peroneal tunnel, predisposing to peroneal pathology, such as muscle tears and tendon subluxation. Regardless, advanced imaging performed before the index procedure, along with a general understanding of the PQ and its classic MRI findings, may have prevented the repeat operation in this case.

The PQ muscle is a rare but sometimes missed potential etiology of ankle pain and tendon subluxation. In our patient’s case, the most obvious abnormality, an osteochondroma, may have masked the true cause.

Take-Home Points

• PQ is easily mistaken for a PB tear.
• PQ is best identified on MRI, but commonly missed.
• For symptomatic cases, excision is the best treatment.
• Consider PQ in patients with chronic ankle pain, swelling, and/or instability.

The peroneus quartus (PQ) is an accessory muscle arising from the leg’s lateral compartment, which typically contains the peroneus longus (PL) and the peroneus brevis (PB). The many cadaveric studies that have been conducted indicate a general population prevalence ranging from 6.6% to 23%.¹ Radiographic studies, including magnetic resonance imaging (MRI) and ultrasonography, have shown a similar prevalence.² Although the PQ is asymptomatic in most cases, it may compromise the space of the superior peroneal tunnel and cause problems, including ankle pain, PB tear, subluxation of peroneal tendons, tendinous calcification, painful hypertrophy of retrotrochlear eminence, and recurrent hematomas.^1,3-5 Given its differing anatomy, the PQ variously has been referred to as peroneocalcaneus externum, peroneocuboideus, long peroneal tendon, and peroneoperoneolongus.¹ 

Although the PQ’s origin and insertion differ between subjects, the most common origin is the muscle fibers of the PB, and the most common insertion is the retrotrochlear eminence of the calcaneum.³

We report a case of peroneal tendon pathology that was initially thought to be caused primarily by impingement of a large osteochondroma on the tendons, but was later thought to be caused in part by a PQ and a split PB tendon seen only at the time of the second operation. The patient provided written informed consent for print and electronic publication of this case report.

Case Report

A 16-year-old boy with an osteochondroma of the right distal fibula presented to clinic with the chief complaint of lateral right ankle pain. A “sharp” pain accompanied by audible “popping” occurred with ankle motion. Medical history was significant only for non-Hodgkin lymphoma treated with bone marrow transplantation and whole body radiation at a young age. Physical examination revealed a palpable exostosis of the distal right fibula and associated ankle swelling.

One year after surgery, the patient returned with recurring right ankle pain and audible popping during ankle movement. There was no appreciable peroneal tendon subluxation on physical examination. Repeat imaging of the ankle showed no recurrence of the osteochondroma (Figure 2).

Discussion

Absence of a PQ muscle in simian and prosimian species suggests that the PQ represents an evolutionary adaptation to evert the lateral foot and improve bipedal gait. Although the 3 peroneal (PL, PB, peroneus tertius [PT]) muscles evert the middle part of the lateral border of the foot, the PQ inserts on the retrotrochlear eminence, which everts the posterior part of the lateral border of the foot.^1,6 The PQ has often been described as a variation of the PB. The PQ may also stabilize the ankle and reduce the energy required for walking. A similar functional adaptation has been proposed for the PT, which dorsiflexes at the ankle. Although presence of a PT also varies in the population, its occurrence does not correlate with presence of a PQ. In people with PQ muscles, there is an 83% to 95% incidence of also having PT muscles.⁷

PQ prevalence has ranged from 6.6% to 23% in cadaver studies² and from 7% to 17% in radiologic studies.¹ To better evaluate prevalence, Yammine² performed a meta-analysis of data from 46 studies (cadaveric dissection, MRI, ultrasonography) and 3928 legs and found an overall incidence of 10.2% and a higher incidence in the Indian population than in other races. Another study found no correlation between PQ presence and sex.⁷

MRI is the best imaging modality for assessing for PQ but must be performed specifically for this anatomical variation. Axial images may show a fat pad separating the PQ muscle from the PB muscle.⁸ On imaging, a PQ muscle can be mistaken for a peroneal tendon tear. A feature that helps in distinguishing the 2 is location; the PQ typically is found posterior and medial to the PL and PB tendons, whereas PB tears are anterior to the retromalleolar groove.² Presence of a PQ muscle may be missed on initial MRI, as occurred in our patient’s case. Zammit and Singh³ reviewed 80 leg MRIs and found 6 PQs. Only 1 of the 6 reports described the PQ as an “atypical appearance of peroneus brevis [that] appears to be made up of more than one tendon.”

Surgical excision is often adequate treatment for a symptomatic PQ. If the PQ muscle is small and symptomatic from pressure to the muscle mass, a short fasciotomy may be performed.⁹ More commonly, complete excision of the accessory muscle is required. Although the PQ muscle is usually asymptomatic, it should be considered in cases of chronic ankle pain, swelling, or instability; recurrent hematomas; and peroneal tendon subluxation or tears.^5,7

Our patient’s diagnosis was initially overlooked because of an osteochondroma in the region of interest. It remains unclear whether his pain was caused by the PQ itself or, more likely, from the PB tear. It is thought that the accessory muscle adds bulk to the peroneal tunnel, predisposing to peroneal pathology, such as muscle tears and tendon subluxation. Regardless, advanced imaging performed before the index procedure, along with a general understanding of the PQ and its classic MRI findings, may have prevented the repeat operation in this case.

The PQ muscle is a rare but sometimes missed potential etiology of ankle pain and tendon subluxation. In our patient’s case, the most obvious abnormality, an osteochondroma, may have masked the true cause.

Take-Home Points

• PQ is easily mistaken for a PB tear.
• PQ is best identified on MRI, but commonly missed.
• For symptomatic cases, excision is the best treatment.
• Consider PQ in patients with chronic ankle pain, swelling, and/or instability.

The peroneus quartus (PQ) is an accessory muscle arising from the leg’s lateral compartment, which typically contains the peroneus longus (PL) and the peroneus brevis (PB). The many cadaveric studies that have been conducted indicate a general population prevalence ranging from 6.6% to 23%.¹ Radiographic studies, including magnetic resonance imaging (MRI) and ultrasonography, have shown a similar prevalence.² Although the PQ is asymptomatic in most cases, it may compromise the space of the superior peroneal tunnel and cause problems, including ankle pain, PB tear, subluxation of peroneal tendons, tendinous calcification, painful hypertrophy of retrotrochlear eminence, and recurrent hematomas.^1,3-5 Given its differing anatomy, the PQ variously has been referred to as peroneocalcaneus externum, peroneocuboideus, long peroneal tendon, and peroneoperoneolongus.¹ 

Although the PQ’s origin and insertion differ between subjects, the most common origin is the muscle fibers of the PB, and the most common insertion is the retrotrochlear eminence of the calcaneum.³

We report a case of peroneal tendon pathology that was initially thought to be caused primarily by impingement of a large osteochondroma on the tendons, but was later thought to be caused in part by a PQ and a split PB tendon seen only at the time of the second operation. The patient provided written informed consent for print and electronic publication of this case report.

Case Report

A 16-year-old boy with an osteochondroma of the right distal fibula presented to clinic with the chief complaint of lateral right ankle pain. A “sharp” pain accompanied by audible “popping” occurred with ankle motion. Medical history was significant only for non-Hodgkin lymphoma treated with bone marrow transplantation and whole body radiation at a young age. Physical examination revealed a palpable exostosis of the distal right fibula and associated ankle swelling.

One year after surgery, the patient returned with recurring right ankle pain and audible popping during ankle movement. There was no appreciable peroneal tendon subluxation on physical examination. Repeat imaging of the ankle showed no recurrence of the osteochondroma (Figure 2).

Discussion

Absence of a PQ muscle in simian and prosimian species suggests that the PQ represents an evolutionary adaptation to evert the lateral foot and improve bipedal gait. Although the 3 peroneal (PL, PB, peroneus tertius [PT]) muscles evert the middle part of the lateral border of the foot, the PQ inserts on the retrotrochlear eminence, which everts the posterior part of the lateral border of the foot.^1,6 The PQ has often been described as a variation of the PB. The PQ may also stabilize the ankle and reduce the energy required for walking. A similar functional adaptation has been proposed for the PT, which dorsiflexes at the ankle. Although presence of a PT also varies in the population, its occurrence does not correlate with presence of a PQ. In people with PQ muscles, there is an 83% to 95% incidence of also having PT muscles.⁷

PQ prevalence has ranged from 6.6% to 23% in cadaver studies² and from 7% to 17% in radiologic studies.¹ To better evaluate prevalence, Yammine² performed a meta-analysis of data from 46 studies (cadaveric dissection, MRI, ultrasonography) and 3928 legs and found an overall incidence of 10.2% and a higher incidence in the Indian population than in other races. Another study found no correlation between PQ presence and sex.⁷

MRI is the best imaging modality for assessing for PQ but must be performed specifically for this anatomical variation. Axial images may show a fat pad separating the PQ muscle from the PB muscle.⁸ On imaging, a PQ muscle can be mistaken for a peroneal tendon tear. A feature that helps in distinguishing the 2 is location; the PQ typically is found posterior and medial to the PL and PB tendons, whereas PB tears are anterior to the retromalleolar groove.² Presence of a PQ muscle may be missed on initial MRI, as occurred in our patient’s case. Zammit and Singh³ reviewed 80 leg MRIs and found 6 PQs. Only 1 of the 6 reports described the PQ as an “atypical appearance of peroneus brevis [that] appears to be made up of more than one tendon.”

Surgical excision is often adequate treatment for a symptomatic PQ. If the PQ muscle is small and symptomatic from pressure to the muscle mass, a short fasciotomy may be performed.⁹ More commonly, complete excision of the accessory muscle is required. Although the PQ muscle is usually asymptomatic, it should be considered in cases of chronic ankle pain, swelling, or instability; recurrent hematomas; and peroneal tendon subluxation or tears.^5,7

Our patient’s diagnosis was initially overlooked because of an osteochondroma in the region of interest. It remains unclear whether his pain was caused by the PQ itself or, more likely, from the PB tear. It is thought that the accessory muscle adds bulk to the peroneal tunnel, predisposing to peroneal pathology, such as muscle tears and tendon subluxation. Regardless, advanced imaging performed before the index procedure, along with a general understanding of the PQ and its classic MRI findings, may have prevented the repeat operation in this case.

The PQ muscle is a rare but sometimes missed potential etiology of ankle pain and tendon subluxation. In our patient’s case, the most obvious abnormality, an osteochondroma, may have masked the true cause.

Syphilis is a chronic systemic infection that has been allotted the epithet “the great imitator” for its gross and histologic similarity to numerous other skin pathologies. Well-characterized for centuries, syphilis features diverse clinical manifestations including a number of cutaneous symptoms.¹

RELATED AUDIOCAST: The Syphilis Epidemic: Dermatologists on the Frontline of Treatment and Diagnosis

The primary stage of infection is classically defined by an asymptomatic chancre at the inoculation site. The secondary stage results from the systemic dissemination of the infection and typically is characterized by cutaneous eruptions, regional lymphadenopathy, and flulike symptoms. This stage gained its notoriety as the great imitator owing to its ability to present with a variety of papulosquamous eruptions. The secondary stage is followed by an asymptomatic latent period that may last months to years, followed by the tertiary stage, which is characterized by the neurologic, cardiovascular, and/or gummatous manifestations that represent the major sources of morbidity and mortality associated with syphilis. It is during the primary, secondary, and early latent stages that the infection is communicable.¹

Case Report

A 40-year-old man presented with multiple intensely pruritic, scattered, erythematous and slightly violaceous, flat-topped papules on the scrotum (Figure 1A) and penile shaft (Figure 1B) of 1 week’s duration. Some of these lesions were annular in appearance. The patient denied any other dermatologic concerns and showed no other skin lesions. A shave biopsy of the right side of the penile shaft was performed, revealing minimal papillary dermis and superficial perivascular dermatitis with substantial perivascular plasmalymphocytic infiltration. The epidermal layer was mildly acanthotic with parakeratosis. A tentative diagnosis of secondary syphilis of unknown latency was made and confirmatory laboratory studies were ordered.

Within weeks, the patient developed a painful 7-mm white patch on the right lower mucosal lip followed several days later by the appearance of a painful lesion on the hard palate (Figure 2 [arrow indicates palatal lesion]) and odynophagia. He presented to the emergency department roughly 3 weeks from the time of index presentation and was started empirically on amoxicillin 500 mg 3 times daily for 10 days for suspicion of strep throat. At a scheduled follow-up with his dermatologist 1 week later, physical examination showed complete resolution of the mucosal lip patch and genital lesions. A round erythematous patch on the right hard palate consistent with a resolving mucosal patch also was noted. A diagnosis of secondary syphilitic infection was made with a rapid plasma reagin (RPR) titer of 1:32 (reference range, <1:1) and positive Treponema antibodies. The patient was treated with a single dose of intramuscular benzathine penicillin G 2.4 million U to prevent the development of tertiary syphilis.

Comment

Incidence
Syphilis has been well characterized since the early 15th century, though its geographic origin remains a topic of controversy.² Although acquired syphilis infections represented a major source of morbidity and mortality in the early 20th century, the prevalence of syphilis in the United States declined substantially thereafter due to improved public health management.² Syphilis was relatively rare in the United States by the year 1956, with fewer than 7000 cases of primary and secondary disease reported annually.³ The incidence of primary and secondary syphilis infections in the United States increased gradually until 1990 before declining precipitously and reaching an unprecedented low of 2.2 cases per 100,000 individuals in 2000.⁴ These shifts ultimately have resulted in decreased clinical familiarity with the disease presentation of syphilis among many health care providers. Since 2000, the incidence of syphilis infection has increased in the United States, with the greatest increases seen in men who have sex with men, intravenous drug users, and human immunodeficiency virus–infected individuals.^5-7

RELATED ARTICLE: Syphilis and the Dermatologist

Pathogenesis and Transmission
The causative agent in syphilis infection is the bacterium Treponema pallidum, a member of the family Spirochaetaceae, which is distinguished by its thin, regularly coiled form and distinctive corkscrew motility.⁸ Syphilis is communicated primarily by sexual contact or in utero exposure during the primary and secondary stages of maternal infection.⁹ At the time of presentation, our patient denied having any new sexual partners or practices. He reported a monogamous heterosexual relationship within the months preceding presentation, suggesting historical inaccuracy on the part of the patient or probable infidelity in the reported relationship as an alternative means of infection transmission. Untreated individuals may be contagious for longer than 1 year,⁹ making transmission patterns difficult to track clinically.

Presentation
The clinical presentation of infection with T pallidum results from dual humoral and cell-mediated inflammatory responses in the host. The primary stage is classically defined by a single chancre, which develops at the inoculation site(s) 9 to 90 days following exposure. The chancre typically begins as a small papule that rapidly develops into a painless ulcer characterized by an indurated border, red base, bordering edema, and a diameter of 2 cm or less. Indolent regional lymphadenopathy often is observed in conjunction with the primary chancre.¹⁰ Our case is notable for the absence of a primary syphilitic lesion and lack of adenopathy. The primary chancre of syphilis typically resolves within 3 to 6 weeks of onset regardless of whether the patient is treated,⁴ thus suggesting the rare possibility that our patient developed a painless primary chancre without realizing it.

The secondary stage of syphilis infection arises weeks to months after resolution of the primary chancre and is triggered by hematogenous and lymphatic dissemination of the bacteria. The symptoms of secondary syphilis are primarily flulike and may include headache, malaise, fatigue, sore throat, arthralgia, and low-grade fever.⁹ Nontender regional lymphadenopathy and splenomegaly also have been reported.¹¹ Our patient denied any systemic concerns throughout the duration of his illness, with the exception of odynophagia in association with ulceration of the oral mucosa. Abnormal laboratory findings in secondary syphilis are nonspecific and may include an elevated erythrocyte sedimentation rate and/or an increased white blood cell count with absolute lymphocytosis.¹² Laboratory studies drawn at the time of presentation showed no such abnormalities in our patient.

The cutaneous signs of secondary syphilis arise concurrently with systemic manifestations and are a common finding, with lesions of the skin or oral mucosa present in up to 80% of patients,¹³ as in our case. Oral lesions classically involve ulcerations at the tip and sides of the tongue,¹² which is distinct from our patient who developed oral lesions of the mucosal lip and hard palate.

Secondary syphilis classically features a copper-colored maculopapular rash with sharply delineated margins typically present on the palmar and plantar surfaces.¹⁴ Verrucous lesions appearing as moist exophytic plaques on the genitals, intertriginous areas, and/or perineum also have been described and are referred to as condyloma lata in the setting of secondary syphilis.¹⁵ In contrast to these classic findings, our patient demonstrated lichenoid lesions on the genitalia and white mucosal patches on the oral mucosa. Our case also was highly unusual because of the intense pruritus associated with the genital lesions, which starkly contrasts most secondary-stage cutaneous lesions that are classically asymptomatic.¹⁴ Additionally, our case was distinctive due to the lack of palmar or plantar involvement, which is considered a characteristic feature of secondary cutaneous syphilis.¹ Finally, our case was notable for the presence of multiple annular cutaneous lesions, which indicated a late secondary-stage infection during which involution of the lesions produced endarteritis as deeper vessels became involved. A 20-year retrospective study by Abell et al¹¹ demonstrated that 40% of syphilitic rashes are macular, 40% are maculopapular, 10% are papular (as in our case), and the remaining 10% are not easily grouped within these categories.

Differential Diagnosis
It has been estimated that approximately 8% of cutaneous syphilitic lesions demonstrate morphology and distributions suggestive of other dermatologic conditions, including atopic dermatitis, pityriasis rosea, psoriasis, drug-induced eruptions, erythema multiforme, mycosis fungoides, and far more uncommonly lichenoid lesions,^16,17 as in our case.

Histopathology
It has been demonstrated that the gross appearance of the secondary syphilitic lesion depends both on the degree of inflammatory infiltrate and the extent of vascular involvement producing ischemia of the skin.¹ Our case presented with small, flat-topped, papular lesions that grossly resembled lichen planus and were ultimately shown to be the product of dense lymphomononuclear infiltration extending perivascularly and throughout the superficial and deep dermis.

Biopsy of a lesion is one means of diagnosis, though the histologic appearance of secondary syphilis can mimic many other diseases. In primary and secondary syphilis, skin biopsy characteristically shows central thinning or ulceration of the epidermal layer with heavy dermal lymphocyte infiltration, lymphovascular proliferation with endarteritis, small-vessel thrombosis, and dermal necrosis. Lichen planus–type dermatitis is histologically characterized by hyperkeratosis, irregular epidermal hyperplasia, and a dermoepidermal junction that may be obscured by a dense lymphomononuclear infiltrate.⁹ The specimen taken from our patient showed minimal infiltrate in the papillary dermis, suggesting a diagnosis of secondary syphilis with lichenoid features. Despite a gross appearance consistent with lichen planus, the biopsy lacked the hydropic degeneration of the basal layer and keratinocyte necrosis that typically characterize this condition.

Diagnosis
Serologic testing for syphilis infection is comprised of nontreponemal and treponemal studies. Nontreponemal testing, which includes the RPR and VDRL test, detects antibodies to cardiolipin-lecithin antigen, a lipid component of the cell membranes of T pallidum. Because the specificity of these tests is fairly low, they typically are used only for screening and monitoring of disease progression and/or response to treatment. Approximately 25% of cases in the United States of primary syphilis are not detected by nontreponemal testing, whereas a nonreactive test nearly always excludes a diagnosis of secondary or latent-stage syphilitic infection.⁹ Indeed, nontreponemal studies show the highest antibody titers during the late secondary and early latent stages of infection with declining titers thereafter, even in the absence of antibiotic treatment. In our case, diagnosis was made by biopsy and RPR was used for staging; RPR was reactive at a dilution of 1:32, indicative of secondary or early latent infection.

Treponemal testing, which includes the fluorescent treponemal antibody absorption test, and multiplex flow immunoassay detects antibodies that are specific to syphilis infection. Treponemal antibodies are detectable earlier in the course of infection than nontreponemal antibodies and remain permanently detectable even following treatment. Because of its high specificity, treponemal testing often is used to confirm diagnosis after positive screening with nontreponemal tests.⁴ Positive fluorescent treponemal antibody absorption testing and positive multiplex flow immunoassay may be used to confirm the diagnosis of T pallidum infection.

The tertiary stage of syphilis infection can occur years after conclusion of the secondary stage and is comprised of one or more of the following: gummas, aortic dilatation or dissection, and neurosyphilitic manifestations such as tabes dorsalis or general paresis.¹ It is of vital importance to identify syphilis infection prior to the onset of the tertiary stage to prevent substantial morbidity and mortality.

Treatment
Our patient’s symptoms abated after empiric treatment with amoxicillin for presumed streptococcal throat infection after he presented to the emergency department with odynophagia, which is not surprising given the moderate-spectrum coverage of this β-lactam antibiotic as well as the near-complete susceptibility of Treponema spirochetes to amoxicillin in primary and secondary syphilis with notably lower efficacy in latent or tertiary disease. It was essential to treat the patient with a single dose of intramuscular benzathine penicillin G 2.4 million U, which has been shown to reliably prevent recurrence of infection or progression to tertiary syphilis.¹⁸

Conclusion

We present a rare case of lichenoid secondary syphilis in the absence of lesions on the palmar and plantar surfaces. The patient lacked any other cutaneous or systemic manifestations, except for odynophagia in association with oral mucosal lesions. He denied any new sexual partners and did not recall having a primary chancre. Also strikingly unusual in this case was the intense pruritus associated with the genital eruption, which is unlike the classic lack of symptoms experienced in the great majority of eruptions due to secondary syphilis. A clinical appreciation of the many cutaneous manifestations of syphilis infection remains critical to early identification of the disease prior to progression to the tertiary stage and its devastating sequelae.

Syphilis is a chronic systemic infection that has been allotted the epithet “the great imitator” for its gross and histologic similarity to numerous other skin pathologies. Well-characterized for centuries, syphilis features diverse clinical manifestations including a number of cutaneous symptoms.¹

RELATED AUDIOCAST: The Syphilis Epidemic: Dermatologists on the Frontline of Treatment and Diagnosis

The primary stage of infection is classically defined by an asymptomatic chancre at the inoculation site. The secondary stage results from the systemic dissemination of the infection and typically is characterized by cutaneous eruptions, regional lymphadenopathy, and flulike symptoms. This stage gained its notoriety as the great imitator owing to its ability to present with a variety of papulosquamous eruptions. The secondary stage is followed by an asymptomatic latent period that may last months to years, followed by the tertiary stage, which is characterized by the neurologic, cardiovascular, and/or gummatous manifestations that represent the major sources of morbidity and mortality associated with syphilis. It is during the primary, secondary, and early latent stages that the infection is communicable.¹

Case Report

A 40-year-old man presented with multiple intensely pruritic, scattered, erythematous and slightly violaceous, flat-topped papules on the scrotum (Figure 1A) and penile shaft (Figure 1B) of 1 week’s duration. Some of these lesions were annular in appearance. The patient denied any other dermatologic concerns and showed no other skin lesions. A shave biopsy of the right side of the penile shaft was performed, revealing minimal papillary dermis and superficial perivascular dermatitis with substantial perivascular plasmalymphocytic infiltration. The epidermal layer was mildly acanthotic with parakeratosis. A tentative diagnosis of secondary syphilis of unknown latency was made and confirmatory laboratory studies were ordered.

Within weeks, the patient developed a painful 7-mm white patch on the right lower mucosal lip followed several days later by the appearance of a painful lesion on the hard palate (Figure 2 [arrow indicates palatal lesion]) and odynophagia. He presented to the emergency department roughly 3 weeks from the time of index presentation and was started empirically on amoxicillin 500 mg 3 times daily for 10 days for suspicion of strep throat. At a scheduled follow-up with his dermatologist 1 week later, physical examination showed complete resolution of the mucosal lip patch and genital lesions. A round erythematous patch on the right hard palate consistent with a resolving mucosal patch also was noted. A diagnosis of secondary syphilitic infection was made with a rapid plasma reagin (RPR) titer of 1:32 (reference range, <1:1) and positive Treponema antibodies. The patient was treated with a single dose of intramuscular benzathine penicillin G 2.4 million U to prevent the development of tertiary syphilis.

Comment

Incidence
Syphilis has been well characterized since the early 15th century, though its geographic origin remains a topic of controversy.² Although acquired syphilis infections represented a major source of morbidity and mortality in the early 20th century, the prevalence of syphilis in the United States declined substantially thereafter due to improved public health management.² Syphilis was relatively rare in the United States by the year 1956, with fewer than 7000 cases of primary and secondary disease reported annually.³ The incidence of primary and secondary syphilis infections in the United States increased gradually until 1990 before declining precipitously and reaching an unprecedented low of 2.2 cases per 100,000 individuals in 2000.⁴ These shifts ultimately have resulted in decreased clinical familiarity with the disease presentation of syphilis among many health care providers. Since 2000, the incidence of syphilis infection has increased in the United States, with the greatest increases seen in men who have sex with men, intravenous drug users, and human immunodeficiency virus–infected individuals.^5-7

RELATED ARTICLE: Syphilis and the Dermatologist

Pathogenesis and Transmission
The causative agent in syphilis infection is the bacterium Treponema pallidum, a member of the family Spirochaetaceae, which is distinguished by its thin, regularly coiled form and distinctive corkscrew motility.⁸ Syphilis is communicated primarily by sexual contact or in utero exposure during the primary and secondary stages of maternal infection.⁹ At the time of presentation, our patient denied having any new sexual partners or practices. He reported a monogamous heterosexual relationship within the months preceding presentation, suggesting historical inaccuracy on the part of the patient or probable infidelity in the reported relationship as an alternative means of infection transmission. Untreated individuals may be contagious for longer than 1 year,⁹ making transmission patterns difficult to track clinically.

Presentation
The clinical presentation of infection with T pallidum results from dual humoral and cell-mediated inflammatory responses in the host. The primary stage is classically defined by a single chancre, which develops at the inoculation site(s) 9 to 90 days following exposure. The chancre typically begins as a small papule that rapidly develops into a painless ulcer characterized by an indurated border, red base, bordering edema, and a diameter of 2 cm or less. Indolent regional lymphadenopathy often is observed in conjunction with the primary chancre.¹⁰ Our case is notable for the absence of a primary syphilitic lesion and lack of adenopathy. The primary chancre of syphilis typically resolves within 3 to 6 weeks of onset regardless of whether the patient is treated,⁴ thus suggesting the rare possibility that our patient developed a painless primary chancre without realizing it.

The secondary stage of syphilis infection arises weeks to months after resolution of the primary chancre and is triggered by hematogenous and lymphatic dissemination of the bacteria. The symptoms of secondary syphilis are primarily flulike and may include headache, malaise, fatigue, sore throat, arthralgia, and low-grade fever.⁹ Nontender regional lymphadenopathy and splenomegaly also have been reported.¹¹ Our patient denied any systemic concerns throughout the duration of his illness, with the exception of odynophagia in association with ulceration of the oral mucosa. Abnormal laboratory findings in secondary syphilis are nonspecific and may include an elevated erythrocyte sedimentation rate and/or an increased white blood cell count with absolute lymphocytosis.¹² Laboratory studies drawn at the time of presentation showed no such abnormalities in our patient.

The cutaneous signs of secondary syphilis arise concurrently with systemic manifestations and are a common finding, with lesions of the skin or oral mucosa present in up to 80% of patients,¹³ as in our case. Oral lesions classically involve ulcerations at the tip and sides of the tongue,¹² which is distinct from our patient who developed oral lesions of the mucosal lip and hard palate.

Secondary syphilis classically features a copper-colored maculopapular rash with sharply delineated margins typically present on the palmar and plantar surfaces.¹⁴ Verrucous lesions appearing as moist exophytic plaques on the genitals, intertriginous areas, and/or perineum also have been described and are referred to as condyloma lata in the setting of secondary syphilis.¹⁵ In contrast to these classic findings, our patient demonstrated lichenoid lesions on the genitalia and white mucosal patches on the oral mucosa. Our case also was highly unusual because of the intense pruritus associated with the genital lesions, which starkly contrasts most secondary-stage cutaneous lesions that are classically asymptomatic.¹⁴ Additionally, our case was distinctive due to the lack of palmar or plantar involvement, which is considered a characteristic feature of secondary cutaneous syphilis.¹ Finally, our case was notable for the presence of multiple annular cutaneous lesions, which indicated a late secondary-stage infection during which involution of the lesions produced endarteritis as deeper vessels became involved. A 20-year retrospective study by Abell et al¹¹ demonstrated that 40% of syphilitic rashes are macular, 40% are maculopapular, 10% are papular (as in our case), and the remaining 10% are not easily grouped within these categories.

Differential Diagnosis
It has been estimated that approximately 8% of cutaneous syphilitic lesions demonstrate morphology and distributions suggestive of other dermatologic conditions, including atopic dermatitis, pityriasis rosea, psoriasis, drug-induced eruptions, erythema multiforme, mycosis fungoides, and far more uncommonly lichenoid lesions,^16,17 as in our case.

Histopathology
It has been demonstrated that the gross appearance of the secondary syphilitic lesion depends both on the degree of inflammatory infiltrate and the extent of vascular involvement producing ischemia of the skin.¹ Our case presented with small, flat-topped, papular lesions that grossly resembled lichen planus and were ultimately shown to be the product of dense lymphomononuclear infiltration extending perivascularly and throughout the superficial and deep dermis.

Biopsy of a lesion is one means of diagnosis, though the histologic appearance of secondary syphilis can mimic many other diseases. In primary and secondary syphilis, skin biopsy characteristically shows central thinning or ulceration of the epidermal layer with heavy dermal lymphocyte infiltration, lymphovascular proliferation with endarteritis, small-vessel thrombosis, and dermal necrosis. Lichen planus–type dermatitis is histologically characterized by hyperkeratosis, irregular epidermal hyperplasia, and a dermoepidermal junction that may be obscured by a dense lymphomononuclear infiltrate.⁹ The specimen taken from our patient showed minimal infiltrate in the papillary dermis, suggesting a diagnosis of secondary syphilis with lichenoid features. Despite a gross appearance consistent with lichen planus, the biopsy lacked the hydropic degeneration of the basal layer and keratinocyte necrosis that typically characterize this condition.

Diagnosis
Serologic testing for syphilis infection is comprised of nontreponemal and treponemal studies. Nontreponemal testing, which includes the RPR and VDRL test, detects antibodies to cardiolipin-lecithin antigen, a lipid component of the cell membranes of T pallidum. Because the specificity of these tests is fairly low, they typically are used only for screening and monitoring of disease progression and/or response to treatment. Approximately 25% of cases in the United States of primary syphilis are not detected by nontreponemal testing, whereas a nonreactive test nearly always excludes a diagnosis of secondary or latent-stage syphilitic infection.⁹ Indeed, nontreponemal studies show the highest antibody titers during the late secondary and early latent stages of infection with declining titers thereafter, even in the absence of antibiotic treatment. In our case, diagnosis was made by biopsy and RPR was used for staging; RPR was reactive at a dilution of 1:32, indicative of secondary or early latent infection.

Treponemal testing, which includes the fluorescent treponemal antibody absorption test, and multiplex flow immunoassay detects antibodies that are specific to syphilis infection. Treponemal antibodies are detectable earlier in the course of infection than nontreponemal antibodies and remain permanently detectable even following treatment. Because of its high specificity, treponemal testing often is used to confirm diagnosis after positive screening with nontreponemal tests.⁴ Positive fluorescent treponemal antibody absorption testing and positive multiplex flow immunoassay may be used to confirm the diagnosis of T pallidum infection.

The tertiary stage of syphilis infection can occur years after conclusion of the secondary stage and is comprised of one or more of the following: gummas, aortic dilatation or dissection, and neurosyphilitic manifestations such as tabes dorsalis or general paresis.¹ It is of vital importance to identify syphilis infection prior to the onset of the tertiary stage to prevent substantial morbidity and mortality.

Treatment
Our patient’s symptoms abated after empiric treatment with amoxicillin for presumed streptococcal throat infection after he presented to the emergency department with odynophagia, which is not surprising given the moderate-spectrum coverage of this β-lactam antibiotic as well as the near-complete susceptibility of Treponema spirochetes to amoxicillin in primary and secondary syphilis with notably lower efficacy in latent or tertiary disease. It was essential to treat the patient with a single dose of intramuscular benzathine penicillin G 2.4 million U, which has been shown to reliably prevent recurrence of infection or progression to tertiary syphilis.¹⁸

Conclusion

We present a rare case of lichenoid secondary syphilis in the absence of lesions on the palmar and plantar surfaces. The patient lacked any other cutaneous or systemic manifestations, except for odynophagia in association with oral mucosal lesions. He denied any new sexual partners and did not recall having a primary chancre. Also strikingly unusual in this case was the intense pruritus associated with the genital eruption, which is unlike the classic lack of symptoms experienced in the great majority of eruptions due to secondary syphilis. A clinical appreciation of the many cutaneous manifestations of syphilis infection remains critical to early identification of the disease prior to progression to the tertiary stage and its devastating sequelae.

Syphilis is a chronic systemic infection that has been allotted the epithet “the great imitator” for its gross and histologic similarity to numerous other skin pathologies. Well-characterized for centuries, syphilis features diverse clinical manifestations including a number of cutaneous symptoms.¹

RELATED AUDIOCAST: The Syphilis Epidemic: Dermatologists on the Frontline of Treatment and Diagnosis

The primary stage of infection is classically defined by an asymptomatic chancre at the inoculation site. The secondary stage results from the systemic dissemination of the infection and typically is characterized by cutaneous eruptions, regional lymphadenopathy, and flulike symptoms. This stage gained its notoriety as the great imitator owing to its ability to present with a variety of papulosquamous eruptions. The secondary stage is followed by an asymptomatic latent period that may last months to years, followed by the tertiary stage, which is characterized by the neurologic, cardiovascular, and/or gummatous manifestations that represent the major sources of morbidity and mortality associated with syphilis. It is during the primary, secondary, and early latent stages that the infection is communicable.¹

Case Report

A 40-year-old man presented with multiple intensely pruritic, scattered, erythematous and slightly violaceous, flat-topped papules on the scrotum (Figure 1A) and penile shaft (Figure 1B) of 1 week’s duration. Some of these lesions were annular in appearance. The patient denied any other dermatologic concerns and showed no other skin lesions. A shave biopsy of the right side of the penile shaft was performed, revealing minimal papillary dermis and superficial perivascular dermatitis with substantial perivascular plasmalymphocytic infiltration. The epidermal layer was mildly acanthotic with parakeratosis. A tentative diagnosis of secondary syphilis of unknown latency was made and confirmatory laboratory studies were ordered.

Within weeks, the patient developed a painful 7-mm white patch on the right lower mucosal lip followed several days later by the appearance of a painful lesion on the hard palate (Figure 2 [arrow indicates palatal lesion]) and odynophagia. He presented to the emergency department roughly 3 weeks from the time of index presentation and was started empirically on amoxicillin 500 mg 3 times daily for 10 days for suspicion of strep throat. At a scheduled follow-up with his dermatologist 1 week later, physical examination showed complete resolution of the mucosal lip patch and genital lesions. A round erythematous patch on the right hard palate consistent with a resolving mucosal patch also was noted. A diagnosis of secondary syphilitic infection was made with a rapid plasma reagin (RPR) titer of 1:32 (reference range, <1:1) and positive Treponema antibodies. The patient was treated with a single dose of intramuscular benzathine penicillin G 2.4 million U to prevent the development of tertiary syphilis.

Comment

Incidence
Syphilis has been well characterized since the early 15th century, though its geographic origin remains a topic of controversy.² Although acquired syphilis infections represented a major source of morbidity and mortality in the early 20th century, the prevalence of syphilis in the United States declined substantially thereafter due to improved public health management.² Syphilis was relatively rare in the United States by the year 1956, with fewer than 7000 cases of primary and secondary disease reported annually.³ The incidence of primary and secondary syphilis infections in the United States increased gradually until 1990 before declining precipitously and reaching an unprecedented low of 2.2 cases per 100,000 individuals in 2000.⁴ These shifts ultimately have resulted in decreased clinical familiarity with the disease presentation of syphilis among many health care providers. Since 2000, the incidence of syphilis infection has increased in the United States, with the greatest increases seen in men who have sex with men, intravenous drug users, and human immunodeficiency virus–infected individuals.^5-7

RELATED ARTICLE: Syphilis and the Dermatologist

Pathogenesis and Transmission
The causative agent in syphilis infection is the bacterium Treponema pallidum, a member of the family Spirochaetaceae, which is distinguished by its thin, regularly coiled form and distinctive corkscrew motility.⁸ Syphilis is communicated primarily by sexual contact or in utero exposure during the primary and secondary stages of maternal infection.⁹ At the time of presentation, our patient denied having any new sexual partners or practices. He reported a monogamous heterosexual relationship within the months preceding presentation, suggesting historical inaccuracy on the part of the patient or probable infidelity in the reported relationship as an alternative means of infection transmission. Untreated individuals may be contagious for longer than 1 year,⁹ making transmission patterns difficult to track clinically.

Presentation
The clinical presentation of infection with T pallidum results from dual humoral and cell-mediated inflammatory responses in the host. The primary stage is classically defined by a single chancre, which develops at the inoculation site(s) 9 to 90 days following exposure. The chancre typically begins as a small papule that rapidly develops into a painless ulcer characterized by an indurated border, red base, bordering edema, and a diameter of 2 cm or less. Indolent regional lymphadenopathy often is observed in conjunction with the primary chancre.¹⁰ Our case is notable for the absence of a primary syphilitic lesion and lack of adenopathy. The primary chancre of syphilis typically resolves within 3 to 6 weeks of onset regardless of whether the patient is treated,⁴ thus suggesting the rare possibility that our patient developed a painless primary chancre without realizing it.

The secondary stage of syphilis infection arises weeks to months after resolution of the primary chancre and is triggered by hematogenous and lymphatic dissemination of the bacteria. The symptoms of secondary syphilis are primarily flulike and may include headache, malaise, fatigue, sore throat, arthralgia, and low-grade fever.⁹ Nontender regional lymphadenopathy and splenomegaly also have been reported.¹¹ Our patient denied any systemic concerns throughout the duration of his illness, with the exception of odynophagia in association with ulceration of the oral mucosa. Abnormal laboratory findings in secondary syphilis are nonspecific and may include an elevated erythrocyte sedimentation rate and/or an increased white blood cell count with absolute lymphocytosis.¹² Laboratory studies drawn at the time of presentation showed no such abnormalities in our patient.

The cutaneous signs of secondary syphilis arise concurrently with systemic manifestations and are a common finding, with lesions of the skin or oral mucosa present in up to 80% of patients,¹³ as in our case. Oral lesions classically involve ulcerations at the tip and sides of the tongue,¹² which is distinct from our patient who developed oral lesions of the mucosal lip and hard palate.

Secondary syphilis classically features a copper-colored maculopapular rash with sharply delineated margins typically present on the palmar and plantar surfaces.¹⁴ Verrucous lesions appearing as moist exophytic plaques on the genitals, intertriginous areas, and/or perineum also have been described and are referred to as condyloma lata in the setting of secondary syphilis.¹⁵ In contrast to these classic findings, our patient demonstrated lichenoid lesions on the genitalia and white mucosal patches on the oral mucosa. Our case also was highly unusual because of the intense pruritus associated with the genital lesions, which starkly contrasts most secondary-stage cutaneous lesions that are classically asymptomatic.¹⁴ Additionally, our case was distinctive due to the lack of palmar or plantar involvement, which is considered a characteristic feature of secondary cutaneous syphilis.¹ Finally, our case was notable for the presence of multiple annular cutaneous lesions, which indicated a late secondary-stage infection during which involution of the lesions produced endarteritis as deeper vessels became involved. A 20-year retrospective study by Abell et al¹¹ demonstrated that 40% of syphilitic rashes are macular, 40% are maculopapular, 10% are papular (as in our case), and the remaining 10% are not easily grouped within these categories.

Differential Diagnosis
It has been estimated that approximately 8% of cutaneous syphilitic lesions demonstrate morphology and distributions suggestive of other dermatologic conditions, including atopic dermatitis, pityriasis rosea, psoriasis, drug-induced eruptions, erythema multiforme, mycosis fungoides, and far more uncommonly lichenoid lesions,^16,17 as in our case.

Histopathology
It has been demonstrated that the gross appearance of the secondary syphilitic lesion depends both on the degree of inflammatory infiltrate and the extent of vascular involvement producing ischemia of the skin.¹ Our case presented with small, flat-topped, papular lesions that grossly resembled lichen planus and were ultimately shown to be the product of dense lymphomononuclear infiltration extending perivascularly and throughout the superficial and deep dermis.

Biopsy of a lesion is one means of diagnosis, though the histologic appearance of secondary syphilis can mimic many other diseases. In primary and secondary syphilis, skin biopsy characteristically shows central thinning or ulceration of the epidermal layer with heavy dermal lymphocyte infiltration, lymphovascular proliferation with endarteritis, small-vessel thrombosis, and dermal necrosis. Lichen planus–type dermatitis is histologically characterized by hyperkeratosis, irregular epidermal hyperplasia, and a dermoepidermal junction that may be obscured by a dense lymphomononuclear infiltrate.⁹ The specimen taken from our patient showed minimal infiltrate in the papillary dermis, suggesting a diagnosis of secondary syphilis with lichenoid features. Despite a gross appearance consistent with lichen planus, the biopsy lacked the hydropic degeneration of the basal layer and keratinocyte necrosis that typically characterize this condition.

Diagnosis
Serologic testing for syphilis infection is comprised of nontreponemal and treponemal studies. Nontreponemal testing, which includes the RPR and VDRL test, detects antibodies to cardiolipin-lecithin antigen, a lipid component of the cell membranes of T pallidum. Because the specificity of these tests is fairly low, they typically are used only for screening and monitoring of disease progression and/or response to treatment. Approximately 25% of cases in the United States of primary syphilis are not detected by nontreponemal testing, whereas a nonreactive test nearly always excludes a diagnosis of secondary or latent-stage syphilitic infection.⁹ Indeed, nontreponemal studies show the highest antibody titers during the late secondary and early latent stages of infection with declining titers thereafter, even in the absence of antibiotic treatment. In our case, diagnosis was made by biopsy and RPR was used for staging; RPR was reactive at a dilution of 1:32, indicative of secondary or early latent infection.

Treponemal testing, which includes the fluorescent treponemal antibody absorption test, and multiplex flow immunoassay detects antibodies that are specific to syphilis infection. Treponemal antibodies are detectable earlier in the course of infection than nontreponemal antibodies and remain permanently detectable even following treatment. Because of its high specificity, treponemal testing often is used to confirm diagnosis after positive screening with nontreponemal tests.⁴ Positive fluorescent treponemal antibody absorption testing and positive multiplex flow immunoassay may be used to confirm the diagnosis of T pallidum infection.

The tertiary stage of syphilis infection can occur years after conclusion of the secondary stage and is comprised of one or more of the following: gummas, aortic dilatation or dissection, and neurosyphilitic manifestations such as tabes dorsalis or general paresis.¹ It is of vital importance to identify syphilis infection prior to the onset of the tertiary stage to prevent substantial morbidity and mortality.

Treatment
Our patient’s symptoms abated after empiric treatment with amoxicillin for presumed streptococcal throat infection after he presented to the emergency department with odynophagia, which is not surprising given the moderate-spectrum coverage of this β-lactam antibiotic as well as the near-complete susceptibility of Treponema spirochetes to amoxicillin in primary and secondary syphilis with notably lower efficacy in latent or tertiary disease. It was essential to treat the patient with a single dose of intramuscular benzathine penicillin G 2.4 million U, which has been shown to reliably prevent recurrence of infection or progression to tertiary syphilis.¹⁸

Conclusion

We present a rare case of lichenoid secondary syphilis in the absence of lesions on the palmar and plantar surfaces. The patient lacked any other cutaneous or systemic manifestations, except for odynophagia in association with oral mucosal lesions. He denied any new sexual partners and did not recall having a primary chancre. Also strikingly unusual in this case was the intense pruritus associated with the genital eruption, which is unlike the classic lack of symptoms experienced in the great majority of eruptions due to secondary syphilis. A clinical appreciation of the many cutaneous manifestations of syphilis infection remains critical to early identification of the disease prior to progression to the tertiary stage and its devastating sequelae.

Sjögren-Larsson syndrome (SLS) is a rare autosomal-recessive neurocutaneous disorder comprising a triad of ichthyosis, mental retardation, and spastic diplegia or quadriplegia.¹ The disorder was first described by Sjögren and Larsson² in 1957. Early reports of SLS were mainly in white patients, with a particularly high prevalence of 8.3 cases per 100,000 individuals in the county of Västerbotten in Sweden.³ Reports of SLS in Asian and Indian populations are rare.^4,5 We report a case of SLS in an Indian boy.

Case Report

A 12-year-old Indian boy born to nonconsanguineous parents after a full-term pregnancy with normal vaginal delivery presented with generalized dry scaly skin that had been present since 2 months of age. He had a history of delayed milestones (ie, facial recognition, sitting without support at 3 years of age), inability to walk, dysarthria, mental retardation). He had never attended school due to subnormal intellectual functioning. He had a single episode of a tonic-clonic seizure at 4 years of age but was not on any regular antiepileptic medication. There was a history of similar skin lesions in one male sibling of the patient and in 2 maternal uncles. None of them survived beyond early childhood, but detailed information regarding the cutaneous and neurologic manifestations in these family members was not available.

Cutaneous examination revealed lamellarlike ichthyosis on the dorsal aspects of the arms and legs (Figure 1A). Ichthyosis with lichenification was present on the neck, axillae, cubital and popliteal fossae, and abdomen (Figure 1B). The palms and soles showed keratoderma. Neurologic examination of the arms revealed mild rigidity and brisk reflexes. Examination of the legs showed marked rigidity, brisk knee jerks, ankle clonus, extensor plantar reflexes, flexion deformity with contractures, and scissor gait. A Goddard (Seguin) formboard test was performed and indicated a mental age of 4 years. The patient’s IQ was in the range of 25 to 30, indicating a severe degree of subnormality in intellectual functioning. The clinical presentation suggested a diagnosis of SLS.

A skin biopsy from the ichthyotic lesion showed hyperkeratosis, acanthosis, and papillomatosis with sparse superficial perivascular lymphocytic infiltrate, thus confirming the diagnosis of lamellar ichthyosis. Fundus examination was normal. Magnetic resonance imaging (MRI) of the brain revealed confluent symmetrical signal abnormalities along the body of the lateral ventricles, white matter in the perioccipital horn, and in deep white matter of centrum semiovale (Figure 2). Magnetic resonance spectroscopy revealed a narrow lipid peak at approximately 1.3 ppm in the region of signal abnormality (Figure 3). Thus, the diagnosis of SLS was confirmed. Measurement of fatty aldehyde dehydrogenase (FALDH) activity and genetic analysis were not performed due to unavailability.

The patient was treated with topical emollients for the ichthyosis. To reduce his dietary intake of long-chain fatty acids and increase the intake of omega-3 and omega-6 fatty acids, the patient’s parents were advised to use canola, mustard, and/or coconut oil for cooking for the patient, and skim milk was recommended instead of whole milk. Neurodevelopmental techniques in the form of stretching exercises were given to maintain his range of movements. Gutter splints were given to maintain the knees in extension for physiological standing and to prevent osteoporosis. Subsequently, the patient also underwent a multilevel soft-tissue release (hip and knee joints) to relieve the contractures. These measures resulted in considerable improvement and the patient was able to walk with support.

Comment

Presentation
The characteristic clinical features of SLS begin to develop during the intranatal period and infancy.^1,6 Pathologic skin involvement can be detected as early as week 23 of gestation. Preterm births associated with SLS have commonly been described.³ Ichthyosis often is evident at birth, but collodion membrane is uncommon. Severe pruritus is a marked feature unlike most other types of ichthyosis. The ichthyosis often is generalized with prominent involvement of the flexural areas and nape of the neck, varying from fine furfuraceous to larger lamellarlike scales. Velvety orange or brown lichenification often is a predominant feature in the flexures of the arms, legs, neck, and mid abdomen. Mental retardation, developmental delay, and spasticity usually become apparent at 1 to 2 years of age and subsequently are nonprogressive.^6,7 However, patients rarely have been described with normal intellectual functioning.⁷ Spasticity often is more severe in the lower limbs and may lead to contractures, kyphoscoliosis, hip dislocation, and short stature. Delayed speech and dysarthria are common. Parafoveal glistening white dots on the retina are a pathognomonic feature and typically appear in the first 2 years of life; however, they are seen in approximately 30% of patients and increase slightly in number with age.^6,8 There may be associated decreased visual acuity, photophobia, myopia, and astigmatism. Other clinical features include enamel hypoplasia, metaphyseal dysplasia, and epilepsy.^1,6

Gene Mutations
Sjögren-Larsson syndrome is caused by mutation in the aldehyde dehydrogenase 3 family member A2 gene, ALDH3A2 (17p11.2), which codes for FALDH.^1,6,7 The ALDH3A2 gene is 11 exons long and gives rise to 2 protein isoforms that differ in their carboxy-terminal domains; the major isoform, composed of 485 amino acids, localizes to the endoplasmic reticulum. The minor protein isoform (FALDHv) is composed of 508 amino acids, possesses a longer carboxy-terminal, and appears to be targeted to the peroxisome. Several mutations have been reported throughout the ALDH3A2 gene, including missense mutations (most common [38% of cases of SLS⁶]), deletions, insertions, splicing errors, and complex rearrangements. Although several of these mutations are private, several common mutations may be indicative of founder effects (ie, shared ancestry), consanguinity, or recurrent mutational events (mutation hotspots).^6,7 Despite the wide spectrum of mutations, there is very little phenotypic variation, with consistently severe cutaneous and neurological involvement occurring in a majority of patients.⁷ However, Lossos et al⁹ described remarkable phenotypic variation in 6 siblings of an Arab family and suggested that additional unknown genetic or environmental factors may compensate for the biochemical defect.

Lipid Metabolism
Fatty aldehyde dehydrogenase is expressed in almost all cells and tissues and catalyzes the oxidation of fatty aldehydes to fatty acids (eFigure 1). It also is a part of the fatty alcohol:NAD oxidoreductase (FAO) enzyme complex, which catalyzes fatty alcohol oxidation to fatty acid. Fatty aldehyde dehydrogenase deficiency leads to accumulation of long-chain alcohols (eg, hexadecanol, octadecanol, octadecenol) and diversion of fatty alcohol into alternate biosynthetic pathways such as wax esters and 1-O-alkyl-2,3-diacylglycerol.¹⁰ Other lipids that are increased are illustrated in eFigure 2. Accumulation of these lipids, toxic effects of abnormal lipids (especially fatty aldehydes and Schiff base protein-lipid adducts), and lack of essential lipids (eg, polyunsaturated fatty acids, ceramides 1 and 6, triglycerides) are responsible for the classical cutaneous, neurologic, and ophthalmologic features of SLS.

Neurologic Findings
Neurologic changes in SLS result from delayed and deficient myelination. Neuropathological studies have shown ballooning of myelin sheaths, extensive loss of myelin, axonal damage, and astrogliosis. The presence of lipoid material positive for periodic acid–Schiff that stains light rather than dark pink, dense distribution of round/ellipsoid bodies in the white matter of the cerebrum and brainstem positive for periodic acid–Schiff, and proliferation of perivascular macrophages containing lipofuscinlike pigments also have been described.¹³ Possibly, in the absence of FALDH, metabolism of plasmalogens (a major component of myelin) results in increased fatty aldehydes, which are either diverted to fatty alcohols or form adducts with phosphatidylethanolamine and myelin basic proteins (eFigure 1). Magnetic resonance imaging of the brain usually shows hypomyelination involving the periventricular white matter extending from the frontal to the occipital area.^7,14 Mild ventricular enlargement may be an additional feature.¹⁴

A useful application of MRI is the proton magnetic resonance spectroscopy, which quantifies the brain metabolites noninvasively, displaying them as a spectrum on a graph. The spectrum comprises a set of resonances/peaks distributed along an x-axis. The resonances of these metabolites are obtained after suppressing the large signals from water protons. Proton magnetic resonance spectroscopy of the normal brain shows 3 prominent peaks: (1) N-acetylaspartate (NAA) at 2.02 ppm, (2) creatine at 3.02 ppm, and (3) choline at 3.22 ppm. In SLS, cerebral proton MRI spectroscopy reveals a characteristic abnormal, prominent, and narrow lipid peak at 1.3 ppm (corresponding to hexadecanol and octadecanol) and may offer a quantitative parameter for monitoring the effects of therapeutic interventions.^7,14,15 The most intense lipid peaks are located in the periventricular regions in the anterior and posterior trigones. An abnormal but much smaller peak may be seen at 0.8 to 0.9 ppm, corresponding to phytol.¹⁴ Gradual emergence of these changes occurs in the first 2 years of life and then remains stable.¹⁵ Proton magnetic resonance spectroscopy also can be used for screening of SLS heterozygotes.¹⁶ Lipid peaks have been described in other disorders of lipid metabolism, but they are less intense, broader, and disappear on longer echo time sequences.¹⁴

Besides the characteristic parafoveal glistening white dots the retina, optical coherence tomography shows focal hyperreflectivitity in the perifoveal ganglion cell layer and inner plexiform layer of the retina as well as cystoid foveal degeneration.¹⁷ The intraretinal deposition of lipid metabolites probably leads to Müller cell degeneration with subsequent formation of cystoid spaces and atrophic changes in the fovea.

Measurement of FALDH or FAO activity in cultured skin fibroblasts and leukocytes using flurometric or gas chromatography mass spectrometry assays is a reliable biochemical test in cases of SLS as well as in heterozygotes.¹⁷ A decrease in FALDH/FAO activity also can be demonstrated by histochemical staining in skin biopsy.¹¹ Pathologic urinary excretion of LTB4 and 20-OH-LTB4 also is a biochemical marker of SLS. Mutation analysis for a specific gene defect is diagnostic in cases of SLS as well as in heterozygotes. Prenatal diagnosis of SLS is possible by assessing FALDH activity or gene defects in cultured chorionic villus fibroblasts and amniocytes.^18,19

Differential Diagnosis
The differential diagnosis of SLS includes congenital ichthyosiform erythroderma with neurological signs (Tay syndrome, Conradi-Hünermann-Happle syndrome) and neurocutaneous disorders such as neutral lipid storage disease and multiple sulfatase deficiency; however, the nature of the ichthyosis, presence of spastic diplegia/tetraplegia, characteristic parafoveal glistening white dots on the retina, and MRI and proton magnetic resonance spectroscopy findings help to easily differentiate SLS from these disorders.

Treatment
Treatment of SLS mainly is palliative. Ichthyosis can be treated with topical keratolytics, emollients, calcipotriol, and oral retinoids (acitretin).⁶ Zileuton, a 5-lipoxygenase inhibitor, inhibits synthesis of LTB4 and cysteinyl leukotrienes, thereby reducing the severity of pruritus and also has been shown to improve the speed of information processing.¹⁸ Similarly, montelukast, a leuko-triene antagonist, is helpful in relieving the agonizing pruritus.¹⁹ Experimental studies have shown that bezafibrate, a peroxisome proliferator-activated receptor α agonist, induces FALDH activity in fibroblasts of SLS patients that still have some residual FALDH activity, but further research is required to determine whether SLS patients could benefit from treatment.²⁰ Physiotherapy helps in relieving the spasticity to some extent, such as in our case. Dietary intervention with reduced fat intake (up to 30% of total daily calorific requirement) and supplementation with omega-3 and omega-6 fatty acids has shown variable results in anecdotal reports.^21-23 Gene therapy using recombinant adeno-associated virus 2 vectors to restore FALDH has been projected as a future treatment option.²⁴ Despite lack of effective treatment options, most patients of SLS survive well into adulthood.

Conclusion

Because ichthyosis is one of the earliest and prominent symptoms of SLS, a dermatologist can play an important role in early diagnosis. Any child with the classical pattern of ichthyosis should be thoroughly examined for early neurologic signs and investigated to rule out SLS. Proton magnetic resonance spectroscopy serves as a useful adjunct in the diagnosis of SLS by confirming the accumulation of abnormal lipids in the periventricular white matter, especially when specific enzyme analysis and genetic analysis are not available in resource-restricted settings.

Sjögren-Larsson syndrome (SLS) is a rare autosomal-recessive neurocutaneous disorder comprising a triad of ichthyosis, mental retardation, and spastic diplegia or quadriplegia.¹ The disorder was first described by Sjögren and Larsson² in 1957. Early reports of SLS were mainly in white patients, with a particularly high prevalence of 8.3 cases per 100,000 individuals in the county of Västerbotten in Sweden.³ Reports of SLS in Asian and Indian populations are rare.^4,5 We report a case of SLS in an Indian boy.

Case Report

A 12-year-old Indian boy born to nonconsanguineous parents after a full-term pregnancy with normal vaginal delivery presented with generalized dry scaly skin that had been present since 2 months of age. He had a history of delayed milestones (ie, facial recognition, sitting without support at 3 years of age), inability to walk, dysarthria, mental retardation). He had never attended school due to subnormal intellectual functioning. He had a single episode of a tonic-clonic seizure at 4 years of age but was not on any regular antiepileptic medication. There was a history of similar skin lesions in one male sibling of the patient and in 2 maternal uncles. None of them survived beyond early childhood, but detailed information regarding the cutaneous and neurologic manifestations in these family members was not available.

Cutaneous examination revealed lamellarlike ichthyosis on the dorsal aspects of the arms and legs (Figure 1A). Ichthyosis with lichenification was present on the neck, axillae, cubital and popliteal fossae, and abdomen (Figure 1B). The palms and soles showed keratoderma. Neurologic examination of the arms revealed mild rigidity and brisk reflexes. Examination of the legs showed marked rigidity, brisk knee jerks, ankle clonus, extensor plantar reflexes, flexion deformity with contractures, and scissor gait. A Goddard (Seguin) formboard test was performed and indicated a mental age of 4 years. The patient’s IQ was in the range of 25 to 30, indicating a severe degree of subnormality in intellectual functioning. The clinical presentation suggested a diagnosis of SLS.

A skin biopsy from the ichthyotic lesion showed hyperkeratosis, acanthosis, and papillomatosis with sparse superficial perivascular lymphocytic infiltrate, thus confirming the diagnosis of lamellar ichthyosis. Fundus examination was normal. Magnetic resonance imaging (MRI) of the brain revealed confluent symmetrical signal abnormalities along the body of the lateral ventricles, white matter in the perioccipital horn, and in deep white matter of centrum semiovale (Figure 2). Magnetic resonance spectroscopy revealed a narrow lipid peak at approximately 1.3 ppm in the region of signal abnormality (Figure 3). Thus, the diagnosis of SLS was confirmed. Measurement of fatty aldehyde dehydrogenase (FALDH) activity and genetic analysis were not performed due to unavailability.

The patient was treated with topical emollients for the ichthyosis. To reduce his dietary intake of long-chain fatty acids and increase the intake of omega-3 and omega-6 fatty acids, the patient’s parents were advised to use canola, mustard, and/or coconut oil for cooking for the patient, and skim milk was recommended instead of whole milk. Neurodevelopmental techniques in the form of stretching exercises were given to maintain his range of movements. Gutter splints were given to maintain the knees in extension for physiological standing and to prevent osteoporosis. Subsequently, the patient also underwent a multilevel soft-tissue release (hip and knee joints) to relieve the contractures. These measures resulted in considerable improvement and the patient was able to walk with support.

Comment

Presentation
The characteristic clinical features of SLS begin to develop during the intranatal period and infancy.^1,6 Pathologic skin involvement can be detected as early as week 23 of gestation. Preterm births associated with SLS have commonly been described.³ Ichthyosis often is evident at birth, but collodion membrane is uncommon. Severe pruritus is a marked feature unlike most other types of ichthyosis. The ichthyosis often is generalized with prominent involvement of the flexural areas and nape of the neck, varying from fine furfuraceous to larger lamellarlike scales. Velvety orange or brown lichenification often is a predominant feature in the flexures of the arms, legs, neck, and mid abdomen. Mental retardation, developmental delay, and spasticity usually become apparent at 1 to 2 years of age and subsequently are nonprogressive.^6,7 However, patients rarely have been described with normal intellectual functioning.⁷ Spasticity often is more severe in the lower limbs and may lead to contractures, kyphoscoliosis, hip dislocation, and short stature. Delayed speech and dysarthria are common. Parafoveal glistening white dots on the retina are a pathognomonic feature and typically appear in the first 2 years of life; however, they are seen in approximately 30% of patients and increase slightly in number with age.^6,8 There may be associated decreased visual acuity, photophobia, myopia, and astigmatism. Other clinical features include enamel hypoplasia, metaphyseal dysplasia, and epilepsy.^1,6

Gene Mutations
Sjögren-Larsson syndrome is caused by mutation in the aldehyde dehydrogenase 3 family member A2 gene, ALDH3A2 (17p11.2), which codes for FALDH.^1,6,7 The ALDH3A2 gene is 11 exons long and gives rise to 2 protein isoforms that differ in their carboxy-terminal domains; the major isoform, composed of 485 amino acids, localizes to the endoplasmic reticulum. The minor protein isoform (FALDHv) is composed of 508 amino acids, possesses a longer carboxy-terminal, and appears to be targeted to the peroxisome. Several mutations have been reported throughout the ALDH3A2 gene, including missense mutations (most common [38% of cases of SLS⁶]), deletions, insertions, splicing errors, and complex rearrangements. Although several of these mutations are private, several common mutations may be indicative of founder effects (ie, shared ancestry), consanguinity, or recurrent mutational events (mutation hotspots).^6,7 Despite the wide spectrum of mutations, there is very little phenotypic variation, with consistently severe cutaneous and neurological involvement occurring in a majority of patients.⁷ However, Lossos et al⁹ described remarkable phenotypic variation in 6 siblings of an Arab family and suggested that additional unknown genetic or environmental factors may compensate for the biochemical defect.

Lipid Metabolism
Fatty aldehyde dehydrogenase is expressed in almost all cells and tissues and catalyzes the oxidation of fatty aldehydes to fatty acids (eFigure 1). It also is a part of the fatty alcohol:NAD oxidoreductase (FAO) enzyme complex, which catalyzes fatty alcohol oxidation to fatty acid. Fatty aldehyde dehydrogenase deficiency leads to accumulation of long-chain alcohols (eg, hexadecanol, octadecanol, octadecenol) and diversion of fatty alcohol into alternate biosynthetic pathways such as wax esters and 1-O-alkyl-2,3-diacylglycerol.¹⁰ Other lipids that are increased are illustrated in eFigure 2. Accumulation of these lipids, toxic effects of abnormal lipids (especially fatty aldehydes and Schiff base protein-lipid adducts), and lack of essential lipids (eg, polyunsaturated fatty acids, ceramides 1 and 6, triglycerides) are responsible for the classical cutaneous, neurologic, and ophthalmologic features of SLS.

Neurologic Findings
Neurologic changes in SLS result from delayed and deficient myelination. Neuropathological studies have shown ballooning of myelin sheaths, extensive loss of myelin, axonal damage, and astrogliosis. The presence of lipoid material positive for periodic acid–Schiff that stains light rather than dark pink, dense distribution of round/ellipsoid bodies in the white matter of the cerebrum and brainstem positive for periodic acid–Schiff, and proliferation of perivascular macrophages containing lipofuscinlike pigments also have been described.¹³ Possibly, in the absence of FALDH, metabolism of plasmalogens (a major component of myelin) results in increased fatty aldehydes, which are either diverted to fatty alcohols or form adducts with phosphatidylethanolamine and myelin basic proteins (eFigure 1). Magnetic resonance imaging of the brain usually shows hypomyelination involving the periventricular white matter extending from the frontal to the occipital area.^7,14 Mild ventricular enlargement may be an additional feature.¹⁴

A useful application of MRI is the proton magnetic resonance spectroscopy, which quantifies the brain metabolites noninvasively, displaying them as a spectrum on a graph. The spectrum comprises a set of resonances/peaks distributed along an x-axis. The resonances of these metabolites are obtained after suppressing the large signals from water protons. Proton magnetic resonance spectroscopy of the normal brain shows 3 prominent peaks: (1) N-acetylaspartate (NAA) at 2.02 ppm, (2) creatine at 3.02 ppm, and (3) choline at 3.22 ppm. In SLS, cerebral proton MRI spectroscopy reveals a characteristic abnormal, prominent, and narrow lipid peak at 1.3 ppm (corresponding to hexadecanol and octadecanol) and may offer a quantitative parameter for monitoring the effects of therapeutic interventions.^7,14,15 The most intense lipid peaks are located in the periventricular regions in the anterior and posterior trigones. An abnormal but much smaller peak may be seen at 0.8 to 0.9 ppm, corresponding to phytol.¹⁴ Gradual emergence of these changes occurs in the first 2 years of life and then remains stable.¹⁵ Proton magnetic resonance spectroscopy also can be used for screening of SLS heterozygotes.¹⁶ Lipid peaks have been described in other disorders of lipid metabolism, but they are less intense, broader, and disappear on longer echo time sequences.¹⁴

Besides the characteristic parafoveal glistening white dots the retina, optical coherence tomography shows focal hyperreflectivitity in the perifoveal ganglion cell layer and inner plexiform layer of the retina as well as cystoid foveal degeneration.¹⁷ The intraretinal deposition of lipid metabolites probably leads to Müller cell degeneration with subsequent formation of cystoid spaces and atrophic changes in the fovea.

Measurement of FALDH or FAO activity in cultured skin fibroblasts and leukocytes using flurometric or gas chromatography mass spectrometry assays is a reliable biochemical test in cases of SLS as well as in heterozygotes.¹⁷ A decrease in FALDH/FAO activity also can be demonstrated by histochemical staining in skin biopsy.¹¹ Pathologic urinary excretion of LTB4 and 20-OH-LTB4 also is a biochemical marker of SLS. Mutation analysis for a specific gene defect is diagnostic in cases of SLS as well as in heterozygotes. Prenatal diagnosis of SLS is possible by assessing FALDH activity or gene defects in cultured chorionic villus fibroblasts and amniocytes.^18,19

Differential Diagnosis
The differential diagnosis of SLS includes congenital ichthyosiform erythroderma with neurological signs (Tay syndrome, Conradi-Hünermann-Happle syndrome) and neurocutaneous disorders such as neutral lipid storage disease and multiple sulfatase deficiency; however, the nature of the ichthyosis, presence of spastic diplegia/tetraplegia, characteristic parafoveal glistening white dots on the retina, and MRI and proton magnetic resonance spectroscopy findings help to easily differentiate SLS from these disorders.

Treatment
Treatment of SLS mainly is palliative. Ichthyosis can be treated with topical keratolytics, emollients, calcipotriol, and oral retinoids (acitretin).⁶ Zileuton, a 5-lipoxygenase inhibitor, inhibits synthesis of LTB4 and cysteinyl leukotrienes, thereby reducing the severity of pruritus and also has been shown to improve the speed of information processing.¹⁸ Similarly, montelukast, a leuko-triene antagonist, is helpful in relieving the agonizing pruritus.¹⁹ Experimental studies have shown that bezafibrate, a peroxisome proliferator-activated receptor α agonist, induces FALDH activity in fibroblasts of SLS patients that still have some residual FALDH activity, but further research is required to determine whether SLS patients could benefit from treatment.²⁰ Physiotherapy helps in relieving the spasticity to some extent, such as in our case. Dietary intervention with reduced fat intake (up to 30% of total daily calorific requirement) and supplementation with omega-3 and omega-6 fatty acids has shown variable results in anecdotal reports.^21-23 Gene therapy using recombinant adeno-associated virus 2 vectors to restore FALDH has been projected as a future treatment option.²⁴ Despite lack of effective treatment options, most patients of SLS survive well into adulthood.

Conclusion

Because ichthyosis is one of the earliest and prominent symptoms of SLS, a dermatologist can play an important role in early diagnosis. Any child with the classical pattern of ichthyosis should be thoroughly examined for early neurologic signs and investigated to rule out SLS. Proton magnetic resonance spectroscopy serves as a useful adjunct in the diagnosis of SLS by confirming the accumulation of abnormal lipids in the periventricular white matter, especially when specific enzyme analysis and genetic analysis are not available in resource-restricted settings.

Sjögren-Larsson syndrome (SLS) is a rare autosomal-recessive neurocutaneous disorder comprising a triad of ichthyosis, mental retardation, and spastic diplegia or quadriplegia.¹ The disorder was first described by Sjögren and Larsson² in 1957. Early reports of SLS were mainly in white patients, with a particularly high prevalence of 8.3 cases per 100,000 individuals in the county of Västerbotten in Sweden.³ Reports of SLS in Asian and Indian populations are rare.^4,5 We report a case of SLS in an Indian boy.

Case Report

A 12-year-old Indian boy born to nonconsanguineous parents after a full-term pregnancy with normal vaginal delivery presented with generalized dry scaly skin that had been present since 2 months of age. He had a history of delayed milestones (ie, facial recognition, sitting without support at 3 years of age), inability to walk, dysarthria, mental retardation). He had never attended school due to subnormal intellectual functioning. He had a single episode of a tonic-clonic seizure at 4 years of age but was not on any regular antiepileptic medication. There was a history of similar skin lesions in one male sibling of the patient and in 2 maternal uncles. None of them survived beyond early childhood, but detailed information regarding the cutaneous and neurologic manifestations in these family members was not available.

Cutaneous examination revealed lamellarlike ichthyosis on the dorsal aspects of the arms and legs (Figure 1A). Ichthyosis with lichenification was present on the neck, axillae, cubital and popliteal fossae, and abdomen (Figure 1B). The palms and soles showed keratoderma. Neurologic examination of the arms revealed mild rigidity and brisk reflexes. Examination of the legs showed marked rigidity, brisk knee jerks, ankle clonus, extensor plantar reflexes, flexion deformity with contractures, and scissor gait. A Goddard (Seguin) formboard test was performed and indicated a mental age of 4 years. The patient’s IQ was in the range of 25 to 30, indicating a severe degree of subnormality in intellectual functioning. The clinical presentation suggested a diagnosis of SLS.

A skin biopsy from the ichthyotic lesion showed hyperkeratosis, acanthosis, and papillomatosis with sparse superficial perivascular lymphocytic infiltrate, thus confirming the diagnosis of lamellar ichthyosis. Fundus examination was normal. Magnetic resonance imaging (MRI) of the brain revealed confluent symmetrical signal abnormalities along the body of the lateral ventricles, white matter in the perioccipital horn, and in deep white matter of centrum semiovale (Figure 2). Magnetic resonance spectroscopy revealed a narrow lipid peak at approximately 1.3 ppm in the region of signal abnormality (Figure 3). Thus, the diagnosis of SLS was confirmed. Measurement of fatty aldehyde dehydrogenase (FALDH) activity and genetic analysis were not performed due to unavailability.

The patient was treated with topical emollients for the ichthyosis. To reduce his dietary intake of long-chain fatty acids and increase the intake of omega-3 and omega-6 fatty acids, the patient’s parents were advised to use canola, mustard, and/or coconut oil for cooking for the patient, and skim milk was recommended instead of whole milk. Neurodevelopmental techniques in the form of stretching exercises were given to maintain his range of movements. Gutter splints were given to maintain the knees in extension for physiological standing and to prevent osteoporosis. Subsequently, the patient also underwent a multilevel soft-tissue release (hip and knee joints) to relieve the contractures. These measures resulted in considerable improvement and the patient was able to walk with support.

Comment

Presentation
The characteristic clinical features of SLS begin to develop during the intranatal period and infancy.^1,6 Pathologic skin involvement can be detected as early as week 23 of gestation. Preterm births associated with SLS have commonly been described.³ Ichthyosis often is evident at birth, but collodion membrane is uncommon. Severe pruritus is a marked feature unlike most other types of ichthyosis. The ichthyosis often is generalized with prominent involvement of the flexural areas and nape of the neck, varying from fine furfuraceous to larger lamellarlike scales. Velvety orange or brown lichenification often is a predominant feature in the flexures of the arms, legs, neck, and mid abdomen. Mental retardation, developmental delay, and spasticity usually become apparent at 1 to 2 years of age and subsequently are nonprogressive.^6,7 However, patients rarely have been described with normal intellectual functioning.⁷ Spasticity often is more severe in the lower limbs and may lead to contractures, kyphoscoliosis, hip dislocation, and short stature. Delayed speech and dysarthria are common. Parafoveal glistening white dots on the retina are a pathognomonic feature and typically appear in the first 2 years of life; however, they are seen in approximately 30% of patients and increase slightly in number with age.^6,8 There may be associated decreased visual acuity, photophobia, myopia, and astigmatism. Other clinical features include enamel hypoplasia, metaphyseal dysplasia, and epilepsy.^1,6

Gene Mutations
Sjögren-Larsson syndrome is caused by mutation in the aldehyde dehydrogenase 3 family member A2 gene, ALDH3A2 (17p11.2), which codes for FALDH.^1,6,7 The ALDH3A2 gene is 11 exons long and gives rise to 2 protein isoforms that differ in their carboxy-terminal domains; the major isoform, composed of 485 amino acids, localizes to the endoplasmic reticulum. The minor protein isoform (FALDHv) is composed of 508 amino acids, possesses a longer carboxy-terminal, and appears to be targeted to the peroxisome. Several mutations have been reported throughout the ALDH3A2 gene, including missense mutations (most common [38% of cases of SLS⁶]), deletions, insertions, splicing errors, and complex rearrangements. Although several of these mutations are private, several common mutations may be indicative of founder effects (ie, shared ancestry), consanguinity, or recurrent mutational events (mutation hotspots).^6,7 Despite the wide spectrum of mutations, there is very little phenotypic variation, with consistently severe cutaneous and neurological involvement occurring in a majority of patients.⁷ However, Lossos et al⁹ described remarkable phenotypic variation in 6 siblings of an Arab family and suggested that additional unknown genetic or environmental factors may compensate for the biochemical defect.

Lipid Metabolism
Fatty aldehyde dehydrogenase is expressed in almost all cells and tissues and catalyzes the oxidation of fatty aldehydes to fatty acids (eFigure 1). It also is a part of the fatty alcohol:NAD oxidoreductase (FAO) enzyme complex, which catalyzes fatty alcohol oxidation to fatty acid. Fatty aldehyde dehydrogenase deficiency leads to accumulation of long-chain alcohols (eg, hexadecanol, octadecanol, octadecenol) and diversion of fatty alcohol into alternate biosynthetic pathways such as wax esters and 1-O-alkyl-2,3-diacylglycerol.¹⁰ Other lipids that are increased are illustrated in eFigure 2. Accumulation of these lipids, toxic effects of abnormal lipids (especially fatty aldehydes and Schiff base protein-lipid adducts), and lack of essential lipids (eg, polyunsaturated fatty acids, ceramides 1 and 6, triglycerides) are responsible for the classical cutaneous, neurologic, and ophthalmologic features of SLS.

Neurologic Findings
Neurologic changes in SLS result from delayed and deficient myelination. Neuropathological studies have shown ballooning of myelin sheaths, extensive loss of myelin, axonal damage, and astrogliosis. The presence of lipoid material positive for periodic acid–Schiff that stains light rather than dark pink, dense distribution of round/ellipsoid bodies in the white matter of the cerebrum and brainstem positive for periodic acid–Schiff, and proliferation of perivascular macrophages containing lipofuscinlike pigments also have been described.¹³ Possibly, in the absence of FALDH, metabolism of plasmalogens (a major component of myelin) results in increased fatty aldehydes, which are either diverted to fatty alcohols or form adducts with phosphatidylethanolamine and myelin basic proteins (eFigure 1). Magnetic resonance imaging of the brain usually shows hypomyelination involving the periventricular white matter extending from the frontal to the occipital area.^7,14 Mild ventricular enlargement may be an additional feature.¹⁴

A useful application of MRI is the proton magnetic resonance spectroscopy, which quantifies the brain metabolites noninvasively, displaying them as a spectrum on a graph. The spectrum comprises a set of resonances/peaks distributed along an x-axis. The resonances of these metabolites are obtained after suppressing the large signals from water protons. Proton magnetic resonance spectroscopy of the normal brain shows 3 prominent peaks: (1) N-acetylaspartate (NAA) at 2.02 ppm, (2) creatine at 3.02 ppm, and (3) choline at 3.22 ppm. In SLS, cerebral proton MRI spectroscopy reveals a characteristic abnormal, prominent, and narrow lipid peak at 1.3 ppm (corresponding to hexadecanol and octadecanol) and may offer a quantitative parameter for monitoring the effects of therapeutic interventions.^7,14,15 The most intense lipid peaks are located in the periventricular regions in the anterior and posterior trigones. An abnormal but much smaller peak may be seen at 0.8 to 0.9 ppm, corresponding to phytol.¹⁴ Gradual emergence of these changes occurs in the first 2 years of life and then remains stable.¹⁵ Proton magnetic resonance spectroscopy also can be used for screening of SLS heterozygotes.¹⁶ Lipid peaks have been described in other disorders of lipid metabolism, but they are less intense, broader, and disappear on longer echo time sequences.¹⁴

Besides the characteristic parafoveal glistening white dots the retina, optical coherence tomography shows focal hyperreflectivitity in the perifoveal ganglion cell layer and inner plexiform layer of the retina as well as cystoid foveal degeneration.¹⁷ The intraretinal deposition of lipid metabolites probably leads to Müller cell degeneration with subsequent formation of cystoid spaces and atrophic changes in the fovea.

Measurement of FALDH or FAO activity in cultured skin fibroblasts and leukocytes using flurometric or gas chromatography mass spectrometry assays is a reliable biochemical test in cases of SLS as well as in heterozygotes.¹⁷ A decrease in FALDH/FAO activity also can be demonstrated by histochemical staining in skin biopsy.¹¹ Pathologic urinary excretion of LTB4 and 20-OH-LTB4 also is a biochemical marker of SLS. Mutation analysis for a specific gene defect is diagnostic in cases of SLS as well as in heterozygotes. Prenatal diagnosis of SLS is possible by assessing FALDH activity or gene defects in cultured chorionic villus fibroblasts and amniocytes.^18,19

Differential Diagnosis
The differential diagnosis of SLS includes congenital ichthyosiform erythroderma with neurological signs (Tay syndrome, Conradi-Hünermann-Happle syndrome) and neurocutaneous disorders such as neutral lipid storage disease and multiple sulfatase deficiency; however, the nature of the ichthyosis, presence of spastic diplegia/tetraplegia, characteristic parafoveal glistening white dots on the retina, and MRI and proton magnetic resonance spectroscopy findings help to easily differentiate SLS from these disorders.

Treatment
Treatment of SLS mainly is palliative. Ichthyosis can be treated with topical keratolytics, emollients, calcipotriol, and oral retinoids (acitretin).⁶ Zileuton, a 5-lipoxygenase inhibitor, inhibits synthesis of LTB4 and cysteinyl leukotrienes, thereby reducing the severity of pruritus and also has been shown to improve the speed of information processing.¹⁸ Similarly, montelukast, a leuko-triene antagonist, is helpful in relieving the agonizing pruritus.¹⁹ Experimental studies have shown that bezafibrate, a peroxisome proliferator-activated receptor α agonist, induces FALDH activity in fibroblasts of SLS patients that still have some residual FALDH activity, but further research is required to determine whether SLS patients could benefit from treatment.²⁰ Physiotherapy helps in relieving the spasticity to some extent, such as in our case. Dietary intervention with reduced fat intake (up to 30% of total daily calorific requirement) and supplementation with omega-3 and omega-6 fatty acids has shown variable results in anecdotal reports.^21-23 Gene therapy using recombinant adeno-associated virus 2 vectors to restore FALDH has been projected as a future treatment option.²⁴ Despite lack of effective treatment options, most patients of SLS survive well into adulthood.

Conclusion

Because ichthyosis is one of the earliest and prominent symptoms of SLS, a dermatologist can play an important role in early diagnosis. Any child with the classical pattern of ichthyosis should be thoroughly examined for early neurologic signs and investigated to rule out SLS. Proton magnetic resonance spectroscopy serves as a useful adjunct in the diagnosis of SLS by confirming the accumulation of abnormal lipids in the periventricular white matter, especially when specific enzyme analysis and genetic analysis are not available in resource-restricted settings.

Case Report

A 58-year-old man presented for evaluation of a pruritic rash involving the pubic area of 30 years’ duration. Multiple primary care physicians and dermatologists had evaluated the patient during this period, but he noted a specific diagnosis had not been rendered and multiple treatments had been unsuccessful. The patient described a rash, which was absent at the time of evaluation, as a self-remitting and exacerbating irritation typically induced by sweating and physical activity. The patient also stated that the irritation was associated with a strong, distinct, musty odor that severely interrupted his sex life and decreased his quality of life. Prior treatments included various topical corticosteroids, topical and oral antibiotics, and various homeopathic treatments that were minimally efficacious or nonefficacious. He was unsure if antifungals had previously been prescribed.

The patient’s medical history was notable for pulmonary interstitial fibrosis, anxiety, posttraumatic stress disorder, and mild glucose intolerance. The patient had no pertinent surgical history and no known drug allergies. Current medications included a bronchodilating inhaler, escitalopram, trazodone, buspirone, clonazepam, prazosin, gabapentin, and azithromycin for current upper respiratory tract infection. The patient was a former smoker and a social drinker.

On physical evaluation the pubic area displayed slight patchy erythema without a papular component and was otherwise unremarkable to the unaided eye. Upon palpation of the skin, there were no remarkable findings. Under dermoscopic evaluation, small white-yellow concretions along the hair shaft were noticed. Evaluation with a Wood lamp is shown in Figure 1.

The patient was treated empirically with ketoconazole cream 2% applied to the affected area once daily until follow-up 3 weeks later. The patient also was advised to shave the pubic area to remove potentially infected hairs, as white piedra (WP) was suspected. A diagnosis of WP was confirmed on histologic evaluation of pubic hair samples approximately 1 to 2 weeks later (Figure 2).

At 3-week follow-up, Wood lamp evaluation did not identify concretions along the pubic hair shafts. The patient was symptom free and extremely pleased. Of note, the patient did not shave the pubic area and was counseled on recurrence.

Comment

Piedra (meaning stone in Spanish) describes a group of fungal infections that present with gritty concretions on the hair shaft.^1,2 In 1911, Horta³ classified piedra into 2 subtypes: black piedra, caused by Piedraia hortae, and WP, caused by Trichosporon species. Black piedra occurs more frequently in tropical countries and commonly affects hair shafts on the scalp.⁴ White piedra most commonly affects the pubic area, with rare cases in scalp and facial hair.^1,5-7

Epidemiology
White piedra is seen worldwide, including Europe, South America, India, Southeast Asia, Africa, South America, and southern parts of the United States. The majority of cases occur in tropical and temperate regions.¹ White piedra likely is underdiagnosed; for example, in a study of 166 young men with genital concerns in Houston, Texas, Trichosporon was isolated in 40% of cultured scrotal hairs.⁸

Species Identification
There are several species of WP; special techniques must be used to differentiate them, which is beyond the scope of this case. The known species include Trichosporon asahii, Trichosporon asteroides, Trichosporon cutaneum, Trichosporon inkin, Trichosporon mucoides, and Trichosporon ovoides.¹Trichosporon asahii and T mucoides have been known to cause systemic infections in immunocompromised hosts known as trichosporonosis.^1,9 As an example of a special technique used for species recognition, Sugita et al¹⁰ used sequence analysis of the ribosomal DNA intergenic spacer 1 regions to distinguish T asahii isolates. Identification of species may be warranted in the proper clinical scenario; however, histologic evaluation by an experienced dermatopathologist frequently is sufficient to identify the Trichosporon genus.

Transmission
The 2 most common causative organisms of WP are T inkin and T ovoides. Furthermore, T inkin causes the vast majority of WP in the pubic region.⁸Trichosporon species may be found in air, soil, water, and sewage,⁷ and have been isolated in hair samples from horses, dogs, and monkeys.¹¹ The mode of transmission in humans remains elusive but has been reported from poor personal hygiene and bathing in stagnant water as well as sexual transmission in the case of pubic infestation.^5,8,11-13

Diagnosis and Differential
White piedra is characterized by the presence of adherent tan to white nodules along the hair shafts. The concretions tend to be softer than black piedra and, unlike trichomycosis, normally do not fluoresce.¹ They do not encircle the hair shaft as hair casts do and can be readily distinguished from Trichomycosis axillaris, black piedra, pediculosis, and trichorrhexis nodosa on microscopic examination.¹⁴ The hair shaft concretions of WP are difficult to visualize with the unaided eye. As a result, it is easily misdiagnosed.¹⁵ Upon palpation of the infected hair shafts, a grainy sensation is evident. Dermoscopy improves visualization, and fluorescence was useful in our case. Microscopic evaluation will identify the adherent organism and is readily cultured on Sabouraud agar.¹⁶ Although Trichosporon species typically do not fluoresce,¹ Wood lamp examination occasionally may reveal the organism, such as in our case. A possible explanation for this finding is the synergistic relationship with Corynebacterium,¹⁷ some producing fluorescent chemicals. Growth of Trichosporon species may be enhanced by or even dependent on Corynebacterium; therefore, WP is likely a coinfection of fungus and bacteria.^17,18 Studies also name a novel species of Brevibacterium in relationship with genital WP.¹⁹ This species was described as producing a foul odor, as in our patient.

Treatment
The American Academy of Dermatology’s Guidelines Committee recommends complete removal of the infected hairs.¹ The recommendation traditionally is hair removal in conjunction with topical or oral medications,¹ such as topical imidazoles, ciclopirox olamine, selenium sulfide 2%, chlorhexidine solution, zinc pyrithione, amphotericin B lotion, and oral itraconazole. Recurrence rates are high and spontaneous remission sometimes occurs.^9,20 Triazole antifungals currently are preferred for treatment of Trichosporon infections.⁵ Patients should be counseled to dispose of undergarments, as the organism has been recovered from cotton fibers and are a source of reinfection.^1,21

Conclusion

White piedra, though relatively uncommon, is likely underdiagnosed in the United States and should be suspected in any patient presenting with irritation and a foul odor in the genital area or multiple failed therapies for a nonspecific genital dermatitis. This clinical scenario warrants dermoscopic and Wood lamp examination of the affected skin and hair shafts in addition to microscopic examination of pubic hair shafts by a dermatopathologist. Fluorescence under Wood lamp may aid in diagnosis, and conflicting findings may be attributed to its synergistic relationship with Corynebacterium and Brevibacterium coinfection. Proper treatment includes shaving of the affected hair, oral or topical antifungal treatment, and disposal of affected clothing.

Case Report

A 58-year-old man presented for evaluation of a pruritic rash involving the pubic area of 30 years’ duration. Multiple primary care physicians and dermatologists had evaluated the patient during this period, but he noted a specific diagnosis had not been rendered and multiple treatments had been unsuccessful. The patient described a rash, which was absent at the time of evaluation, as a self-remitting and exacerbating irritation typically induced by sweating and physical activity. The patient also stated that the irritation was associated with a strong, distinct, musty odor that severely interrupted his sex life and decreased his quality of life. Prior treatments included various topical corticosteroids, topical and oral antibiotics, and various homeopathic treatments that were minimally efficacious or nonefficacious. He was unsure if antifungals had previously been prescribed.

The patient’s medical history was notable for pulmonary interstitial fibrosis, anxiety, posttraumatic stress disorder, and mild glucose intolerance. The patient had no pertinent surgical history and no known drug allergies. Current medications included a bronchodilating inhaler, escitalopram, trazodone, buspirone, clonazepam, prazosin, gabapentin, and azithromycin for current upper respiratory tract infection. The patient was a former smoker and a social drinker.

On physical evaluation the pubic area displayed slight patchy erythema without a papular component and was otherwise unremarkable to the unaided eye. Upon palpation of the skin, there were no remarkable findings. Under dermoscopic evaluation, small white-yellow concretions along the hair shaft were noticed. Evaluation with a Wood lamp is shown in Figure 1.

The patient was treated empirically with ketoconazole cream 2% applied to the affected area once daily until follow-up 3 weeks later. The patient also was advised to shave the pubic area to remove potentially infected hairs, as white piedra (WP) was suspected. A diagnosis of WP was confirmed on histologic evaluation of pubic hair samples approximately 1 to 2 weeks later (Figure 2).

At 3-week follow-up, Wood lamp evaluation did not identify concretions along the pubic hair shafts. The patient was symptom free and extremely pleased. Of note, the patient did not shave the pubic area and was counseled on recurrence.

Comment

Piedra (meaning stone in Spanish) describes a group of fungal infections that present with gritty concretions on the hair shaft.^1,2 In 1911, Horta³ classified piedra into 2 subtypes: black piedra, caused by Piedraia hortae, and WP, caused by Trichosporon species. Black piedra occurs more frequently in tropical countries and commonly affects hair shafts on the scalp.⁴ White piedra most commonly affects the pubic area, with rare cases in scalp and facial hair.^1,5-7

Epidemiology
White piedra is seen worldwide, including Europe, South America, India, Southeast Asia, Africa, South America, and southern parts of the United States. The majority of cases occur in tropical and temperate regions.¹ White piedra likely is underdiagnosed; for example, in a study of 166 young men with genital concerns in Houston, Texas, Trichosporon was isolated in 40% of cultured scrotal hairs.⁸

Species Identification
There are several species of WP; special techniques must be used to differentiate them, which is beyond the scope of this case. The known species include Trichosporon asahii, Trichosporon asteroides, Trichosporon cutaneum, Trichosporon inkin, Trichosporon mucoides, and Trichosporon ovoides.¹Trichosporon asahii and T mucoides have been known to cause systemic infections in immunocompromised hosts known as trichosporonosis.^1,9 As an example of a special technique used for species recognition, Sugita et al¹⁰ used sequence analysis of the ribosomal DNA intergenic spacer 1 regions to distinguish T asahii isolates. Identification of species may be warranted in the proper clinical scenario; however, histologic evaluation by an experienced dermatopathologist frequently is sufficient to identify the Trichosporon genus.

Transmission
The 2 most common causative organisms of WP are T inkin and T ovoides. Furthermore, T inkin causes the vast majority of WP in the pubic region.⁸Trichosporon species may be found in air, soil, water, and sewage,⁷ and have been isolated in hair samples from horses, dogs, and monkeys.¹¹ The mode of transmission in humans remains elusive but has been reported from poor personal hygiene and bathing in stagnant water as well as sexual transmission in the case of pubic infestation.^5,8,11-13

Diagnosis and Differential
White piedra is characterized by the presence of adherent tan to white nodules along the hair shafts. The concretions tend to be softer than black piedra and, unlike trichomycosis, normally do not fluoresce.¹ They do not encircle the hair shaft as hair casts do and can be readily distinguished from Trichomycosis axillaris, black piedra, pediculosis, and trichorrhexis nodosa on microscopic examination.¹⁴ The hair shaft concretions of WP are difficult to visualize with the unaided eye. As a result, it is easily misdiagnosed.¹⁵ Upon palpation of the infected hair shafts, a grainy sensation is evident. Dermoscopy improves visualization, and fluorescence was useful in our case. Microscopic evaluation will identify the adherent organism and is readily cultured on Sabouraud agar.¹⁶ Although Trichosporon species typically do not fluoresce,¹ Wood lamp examination occasionally may reveal the organism, such as in our case. A possible explanation for this finding is the synergistic relationship with Corynebacterium,¹⁷ some producing fluorescent chemicals. Growth of Trichosporon species may be enhanced by or even dependent on Corynebacterium; therefore, WP is likely a coinfection of fungus and bacteria.^17,18 Studies also name a novel species of Brevibacterium in relationship with genital WP.¹⁹ This species was described as producing a foul odor, as in our patient.

Treatment
The American Academy of Dermatology’s Guidelines Committee recommends complete removal of the infected hairs.¹ The recommendation traditionally is hair removal in conjunction with topical or oral medications,¹ such as topical imidazoles, ciclopirox olamine, selenium sulfide 2%, chlorhexidine solution, zinc pyrithione, amphotericin B lotion, and oral itraconazole. Recurrence rates are high and spontaneous remission sometimes occurs.^9,20 Triazole antifungals currently are preferred for treatment of Trichosporon infections.⁵ Patients should be counseled to dispose of undergarments, as the organism has been recovered from cotton fibers and are a source of reinfection.^1,21

Conclusion

White piedra, though relatively uncommon, is likely underdiagnosed in the United States and should be suspected in any patient presenting with irritation and a foul odor in the genital area or multiple failed therapies for a nonspecific genital dermatitis. This clinical scenario warrants dermoscopic and Wood lamp examination of the affected skin and hair shafts in addition to microscopic examination of pubic hair shafts by a dermatopathologist. Fluorescence under Wood lamp may aid in diagnosis, and conflicting findings may be attributed to its synergistic relationship with Corynebacterium and Brevibacterium coinfection. Proper treatment includes shaving of the affected hair, oral or topical antifungal treatment, and disposal of affected clothing.

Case Report

A 58-year-old man presented for evaluation of a pruritic rash involving the pubic area of 30 years’ duration. Multiple primary care physicians and dermatologists had evaluated the patient during this period, but he noted a specific diagnosis had not been rendered and multiple treatments had been unsuccessful. The patient described a rash, which was absent at the time of evaluation, as a self-remitting and exacerbating irritation typically induced by sweating and physical activity. The patient also stated that the irritation was associated with a strong, distinct, musty odor that severely interrupted his sex life and decreased his quality of life. Prior treatments included various topical corticosteroids, topical and oral antibiotics, and various homeopathic treatments that were minimally efficacious or nonefficacious. He was unsure if antifungals had previously been prescribed.

The patient’s medical history was notable for pulmonary interstitial fibrosis, anxiety, posttraumatic stress disorder, and mild glucose intolerance. The patient had no pertinent surgical history and no known drug allergies. Current medications included a bronchodilating inhaler, escitalopram, trazodone, buspirone, clonazepam, prazosin, gabapentin, and azithromycin for current upper respiratory tract infection. The patient was a former smoker and a social drinker.

On physical evaluation the pubic area displayed slight patchy erythema without a papular component and was otherwise unremarkable to the unaided eye. Upon palpation of the skin, there were no remarkable findings. Under dermoscopic evaluation, small white-yellow concretions along the hair shaft were noticed. Evaluation with a Wood lamp is shown in Figure 1.

The patient was treated empirically with ketoconazole cream 2% applied to the affected area once daily until follow-up 3 weeks later. The patient also was advised to shave the pubic area to remove potentially infected hairs, as white piedra (WP) was suspected. A diagnosis of WP was confirmed on histologic evaluation of pubic hair samples approximately 1 to 2 weeks later (Figure 2).

At 3-week follow-up, Wood lamp evaluation did not identify concretions along the pubic hair shafts. The patient was symptom free and extremely pleased. Of note, the patient did not shave the pubic area and was counseled on recurrence.

Comment

Piedra (meaning stone in Spanish) describes a group of fungal infections that present with gritty concretions on the hair shaft.^1,2 In 1911, Horta³ classified piedra into 2 subtypes: black piedra, caused by Piedraia hortae, and WP, caused by Trichosporon species. Black piedra occurs more frequently in tropical countries and commonly affects hair shafts on the scalp.⁴ White piedra most commonly affects the pubic area, with rare cases in scalp and facial hair.^1,5-7

Epidemiology
White piedra is seen worldwide, including Europe, South America, India, Southeast Asia, Africa, South America, and southern parts of the United States. The majority of cases occur in tropical and temperate regions.¹ White piedra likely is underdiagnosed; for example, in a study of 166 young men with genital concerns in Houston, Texas, Trichosporon was isolated in 40% of cultured scrotal hairs.⁸

Species Identification
There are several species of WP; special techniques must be used to differentiate them, which is beyond the scope of this case. The known species include Trichosporon asahii, Trichosporon asteroides, Trichosporon cutaneum, Trichosporon inkin, Trichosporon mucoides, and Trichosporon ovoides.¹Trichosporon asahii and T mucoides have been known to cause systemic infections in immunocompromised hosts known as trichosporonosis.^1,9 As an example of a special technique used for species recognition, Sugita et al¹⁰ used sequence analysis of the ribosomal DNA intergenic spacer 1 regions to distinguish T asahii isolates. Identification of species may be warranted in the proper clinical scenario; however, histologic evaluation by an experienced dermatopathologist frequently is sufficient to identify the Trichosporon genus.

Transmission
The 2 most common causative organisms of WP are T inkin and T ovoides. Furthermore, T inkin causes the vast majority of WP in the pubic region.⁸Trichosporon species may be found in air, soil, water, and sewage,⁷ and have been isolated in hair samples from horses, dogs, and monkeys.¹¹ The mode of transmission in humans remains elusive but has been reported from poor personal hygiene and bathing in stagnant water as well as sexual transmission in the case of pubic infestation.^5,8,11-13

Diagnosis and Differential
White piedra is characterized by the presence of adherent tan to white nodules along the hair shafts. The concretions tend to be softer than black piedra and, unlike trichomycosis, normally do not fluoresce.¹ They do not encircle the hair shaft as hair casts do and can be readily distinguished from Trichomycosis axillaris, black piedra, pediculosis, and trichorrhexis nodosa on microscopic examination.¹⁴ The hair shaft concretions of WP are difficult to visualize with the unaided eye. As a result, it is easily misdiagnosed.¹⁵ Upon palpation of the infected hair shafts, a grainy sensation is evident. Dermoscopy improves visualization, and fluorescence was useful in our case. Microscopic evaluation will identify the adherent organism and is readily cultured on Sabouraud agar.¹⁶ Although Trichosporon species typically do not fluoresce,¹ Wood lamp examination occasionally may reveal the organism, such as in our case. A possible explanation for this finding is the synergistic relationship with Corynebacterium,¹⁷ some producing fluorescent chemicals. Growth of Trichosporon species may be enhanced by or even dependent on Corynebacterium; therefore, WP is likely a coinfection of fungus and bacteria.^17,18 Studies also name a novel species of Brevibacterium in relationship with genital WP.¹⁹ This species was described as producing a foul odor, as in our patient.

Treatment
The American Academy of Dermatology’s Guidelines Committee recommends complete removal of the infected hairs.¹ The recommendation traditionally is hair removal in conjunction with topical or oral medications,¹ such as topical imidazoles, ciclopirox olamine, selenium sulfide 2%, chlorhexidine solution, zinc pyrithione, amphotericin B lotion, and oral itraconazole. Recurrence rates are high and spontaneous remission sometimes occurs.^9,20 Triazole antifungals currently are preferred for treatment of Trichosporon infections.⁵ Patients should be counseled to dispose of undergarments, as the organism has been recovered from cotton fibers and are a source of reinfection.^1,21

Conclusion

White piedra, though relatively uncommon, is likely underdiagnosed in the United States and should be suspected in any patient presenting with irritation and a foul odor in the genital area or multiple failed therapies for a nonspecific genital dermatitis. This clinical scenario warrants dermoscopic and Wood lamp examination of the affected skin and hair shafts in addition to microscopic examination of pubic hair shafts by a dermatopathologist. Fluorescence under Wood lamp may aid in diagnosis, and conflicting findings may be attributed to its synergistic relationship with Corynebacterium and Brevibacterium coinfection. Proper treatment includes shaving of the affected hair, oral or topical antifungal treatment, and disposal of affected clothing.