Clinical Review

Between seven and 20 million people in the United States, including adolescents as young as 12, are estimated to have at least one tattoo.^1-3 Perhaps half later regret the decision to acquire a tattoo—for reasons ranging from an acute inflammatory reaction to the perception that having a tattoo might interfere with opportunities for professional advancement.⁴ The ­rising incidence of tattooing may be accompanied by increasing numbers of persons seeking to have decorative tattoos removed. Health care providers need to be aware of the modalities available, along with the risks and benefits of laser tattoo removal.

Tattoo types vary according to etiology, pigment, depth, and purpose. Cosmetic tattoos (“permanent makeup”) often serve to enhance physical features or mask scars; traumatic tattoos result from an injury in which foreign material is embedded in the skin. This article will focus on decorative tattoos and the clinical options for tattooed patients who regret these permanent markings and desire their removal.⁵

Decorative tattoos can be applied professionally or by amateurs, with pigment initially remaining in the superficial dermis; after several years, the pigment may migrate into deeper layers of the skin.⁶ Amateur tattoos are composed of ink or carbon; these pigments are usually less dense than those used by professionals, often making amateur tattoos easier to remove (ie, about five sessions of laser therapy for 90% clearance vs six to 10; see figures below).^1,7

Professional tattoos are composed of organic pigments that vary in particle size but are applied at a uniform depth of needle penetration.⁵ The deposited pigment particles reside mainly in dermal fibroblasts and macrophages, although smaller collections of particles can be found within the interstitial space.

Tattoo Removal Techniques
Older techniques of tattoo removal, including surgical excision, salabrasion, dermabrasion, cryosurgery, and chemical peels, have largely been relinquished. Not only did these methods fail to yield desirable results, but they were associated with adverse effects, including hypopigmentation and scarring.⁵

Although continuous-wave lasers can also cause scarring, quality-switched (Q-switched) lasers have produced more favorable outcomes. The specific color and absorptive characteristics of each tattoo ink will help determine the ideal laser type to be used. In rare cases, patients may be able to contact the responsible artist and inquire about the inks used; information about the absorption spectrum of each pigment could facilitate the treatment plan. Even with this information, however, removal of intricate, colorful tattoos can be a challenge, since several different lasers, used in stages, may be needed.^1,8

The patient’s skin type, too, may affect the response to treatment. Q-switched lasers are effective for all skin types, but complete pigment removal may be more difficult in lighter-skinned patients¹ (ie, Fitzgerald skin types I and II). Similarly, in older tattoos, complete removal may not be possible, since some dermal pigment may have penetrated too deeply to be reached.⁵

Selective Photothermolysis
Laser removal of tattoos is accomplished by selective photothermolysis, a process that was first described by Anderson and Parrish in 1983.^9,10 Photothermolysis targets specific microscopic sites on the skin, with effectiveness depending on the absorption spectrum of each pigment.4 The epidermis, dermis, and skin appendages are only minimally damaged in the process.⁶

Laser therapy modifies the optic properties of the tattoo pigments to be removed. The pigments absorb short laser pulses, which produce a high-intensity light in the pigments that is converted into heat.9 Shock waves shatter the pigment particles, achieving the selective death of the pigment-containing cells. The chemical composition of the pigment is also altered.

Lastly, the cell debris is phagocytized and transported to regional lymph nodes. Although they are hardly visible, some residual, scattered particles remain in the dermis. Only superficial pigment fragments are entirely eliminated during epidermal desquamation as repair is occurring, a development called transepidermal elimination.⁹

To produce the most effective treatment results, the laser wavelength must be absorbed by the ink, the heat should be confined to the target, and adequate energy must be delivered.¹

Clinician–Patient Communication
Since the cosmetic outcome of laser therapy depends on both the laser wavelength and the absorption spectrum of each pigment, it is important for health care providers to understand the optimal wavelengths for each pigment type. They should be prepared to address with their patients the issues of incompatible lasers and resistance of certain pigments to treatment.¹¹

Additionally, although Q-switched lasers are considered the gold standard for tattoo removal, realistic expectations should be established. Patients interested in treatment must be informed at the outset that complete clearance is not guaranteed and that the number of treatments and end result depend on factors that vary from patient to patient.⁴ Ten to 15 sessions, spaced six to eight weeks apart, may be required to achieve a desirable or even acceptable result,9 and the entire process could take a year or longer. The total cost can reach thousands of dollars.¹²

Before initiating laser therapy (or referring the patient for it), the primary care clinician should collect a history regarding the tattoo’s age and etiology, as well as the patient’s tanning habits, in order to recommend the best treatment. As stated earlier, professional tattoos generally require more treatments than amateur tattoos. Distally located tattoos are the most difficult to remove.^1,13

Q-Switched Laser Types
The most common Q-switched lasers are:

• Q-switched ruby laser

• Q-switched Nd:YAG (neo­dymium:yttrium aluminum garnet) laser

• Q-switched alexandrite laser (see table^1,4,6,14).

The choice of laser type is based on several factors, including the presumed absorption spectrum of the target, the desired depth of penetration, the size of the target particle, and the laser’s wavelength and pulse duration.¹¹

Black and India inks absorb broadly across the spectrum. In the case of blue, yellow, or orange pigment, the optimal wavelength for pigment absorption is in an adjacent color. Green pigment absorption spectra vary due to the pigment’s multiple components. The spectra of white, yellow, and “flesh-colored” pigments do not have absorption peaks at the wavelengths of currently used Q-switched lasers; this explains their resistance to removal.¹¹

Use of the Q-switched ruby laser (QSR) is indicated for the removal of black, blue-black, and dark blue pigments. Mixed results have been reported for removal of green and medium blue pigments, and poor results for red, orange, and pale blue. Six treatments at three-week intervals have been reported to yield clearance of 75% or greater in only about 25% of professional, dark-colored tattoos.^1,15

Since this laser’s wavelength (694 nm) is absorbed by melanin, its use may result in transient hypopigmentation, depigmentation, and textural changes.¹

The Q-switched Nd-YAG lasers (with wavelengths of 532 nm or 1064 nm) have a large spot size, concentrated energy densities, high repetition rates, and greater beam diameter, allowing for rapid, effective treatment of closely clustered and deep tattoos.6 Five treatments of red or orange tattoos may achieve 75% clearance in about 60% of patients.¹

The 1064-nm Nd:YAG laser, which has the deepest penetration and carries the least risk for hypopigmentation,¹ is indicated for black and dark blue pigments. It is considered the ideal choice for tattoo removal in dark-skinned patients,^14,16 since its longer wavelength represents a lower affinity for melanin.⁴ The 532-nm Nd:YAG laser is effective for removal of red, yellow, and orange pigments.⁶ Ten or more treatments may be required for 75% clearance of a professional tattoo.¹

Some adverse effects of Nd:YAG laser use include whitening of the skin, with occasional mild pinpoint bleeding. Use of the 532-nm model is associated with purpura, resulting from hemoglobin absorption; this may last from one week to 10 days. The 1064-nm Nd:YAG laser is the least effective for removing bright-colored pigments.^1,17

The Q-switched alexandrite laser is generally used to remove black, blue, and green pigments. Typically, four to 10 sessions are required at intervals of one to two months. Transient hypopigmentation, typically lasting three to four months, occurs in about half of patients, and textural changes have been reported in about 12%.^6,8

The 510-nm, pulsed-dye Q-switched alexandrite laser is reportedly effective in removing red pigment.⁴

Complications, Adverse Effects, and Their Management
Although Q-switched lasers appear quite effective in tattoo removal, their use is not without adverse effects.

Hypopigmentation
The most common chronic adverse effect of laser treatment is hypopigmentation. The risk is high in dark-skinned patients undergoing treatment with the QSR or alexandrite lasers4 and increases in any patient according to the number of treatment sessions. Hypopigmentation occurs in more than 38% of patients treated with QSR lasers and typically lasts for two to six months.⁶

In a 2004 study, Gundogan et al¹⁸ attempted repigmentation with an excimer laser (Nd:YAG/potassium titanyl phosphate–Nd:YAG) in a patient with hypopigmentation following laser tattoo removal. Repigmentation required 40 treatment sessions over 15 months—not a cost-­effective option.⁶ A better solution might be to minimize the risk for hypopigmentation by use of picosecond lasers (see “Better Options on the Horizon?”, below).⁸

Hyperpigmentation
Hyperpigmentation can occur as a result of melanocytes’ increased melanin production in response to laser-generated heat. This effect is usually temporary, but recovery time varies.⁴ The risk of hyperpigmentation depends largely on skin type, with darker-skinned patients (ie, Fitzgerald type III or IV skin) at higher risk.^6,19 Patients at risk for hyperpigmentation should avoid sun exposure before and after laser treatments; UVA/UVB sun blocks are essential if sun exposure cannot be avoided.¹

Hyperpigmentation can also be treated with hydroquinone or fractional photothermolysis.⁶

Paradoxical Darkening of the Tattoo
Paradoxical darkening occurs when the chemical composition of the ink is changed by laser treatment—for example, from rust-colored ferric oxide to jet black ferrous oxide. Similarly, titanium dioxide contained in white ink that is used to brighten other colors can be reduced to titanium oxide or blue Ti3+ in response to laser therapy.¹ Darkening is often difficult to correct, requiring the use of several lasers, including Q-switched or ablative (eg, ultrapulse CO2, pulsed erbium:YAG) lasers.⁹

In order to avoid darkening, a spot test is recommended. The patient should return to the studio, if possible, and have a sample of the pigment to be removed tattooed in the axillary region. After a month, a laser test spot can be performed. If laser treatment fails, the test spot can be removed by surgical excision, and laser treatment abandoned.⁹

Blistering
Blistering can occur as a result of overaggressive laser treatment or inadvertent absorption of laser energy due to the specific pigment. Blisters may be avoided by using a tissue-cooling system, such as a contact chill tip or cryogen spray.⁴ To avoid adverse effects such as wheals, punctate bleeding, blisters, and crusts, a minimum of four weeks between sessions should be maintained. Topical antiseptics can be used to prevent infection.⁶

Allergic Reactions
Tattoos containing metal salts—mercury (red), cadmium (yellow), chrome (green), or cobalt (blue)—may be subject to a local allergic or photoallergic skin reaction.⁶ A preexisting local allergic reaction may be exacerbated by laser treatment, resulting in urticaria or a systemic allergic reaction. The tattoo should be treated with corticosteroids and an allergist consulted.¹ Some providers recommend avoiding laser therapy altogether.

Red is the pigment most often associated with allergic reactions, resulting in nodular, scaly, pruritic areas.¹² Removal of areas of red pigment with the 532-nm Nd:YAG laser can help prevent complications.⁹ Photoallergic reactions most commonly involve cadmium. Affected patients typically report a history of pruritus in the tattoo and raised skin after UV exposure.

Allergic reactions can also be treated with topical or intralesional corticosteroids.¹²

Scarring
Cobblestone texture is a sign of early scarring, usually appearing within two weeks of treatment. The risk for scarring is highest on the chest, outer upper arm, and ankle.¹

The risk is especially great in laser treatment of areas that have been retattooed (ie, a second tattoo applied to cover an older tattoo) because of the high density of pigment and increased laser resistance.⁹ Patients should be asked about the possible presence of a cover-up tattoo, since this may not be detectable on casual inspection.

In a study of Chinese patients who underwent laser removal of professional blue-black tattoos,²⁰ prophylactic use of a gel containing onion extract, heparin, and allantoin had no effect on pigment clearance, but it reduced the rate of scarring, compared with controls. Additional studies are needed to evaluate the gel’s effectiveness in patients with other skin types and with tattoos containing pigments of various colors.²⁰

Topical steroids are sometimes helpful for scarring.¹ More pronounced scarring resulting from laser tattoo removal can be treated with the erbium:YAG laser or pulsed CO2 laser, as well as fractional photothermolysis.⁶

Cutaneous Lymphoma
Two types of red azo dyes have been shown to generate toxic or carcinogenic decomposition products (eg, nitroaniline) under in vitro conditions; whether this occurs in vivo is unknown. Concern has been expressed that laser stimulation of lymphocytes or dendritic cells could lead to cutaneous lymphoma.⁶

Resistance
Certain pigments are resistant to laser treatment, and multicolored tattoos are difficult to treat because of the limited number of laser wavelengths.¹¹ If a tattoo’s nonresponsive area exceeds 10% of its total area, laser treatment should be abandoned for financial reasons.⁹ A smaller resistant area, however, may be treated with ablative lasers (ultrapulse CO2, pulsed erbium:YAG ). This requires numerous sessions, one to three months apart. Aggressive measures, such as attempting to remove all of the pigment in one session, should be avoided, since heavy scarring can ­occur.⁹

Better Options on the Horizon?
Computer simulations have confirmed that laser tattoo removal is photoacoustic and that shorter pulses delivering the same amount of laser energy as longer pulses may be more efficient. According to Ho et al,²¹ the optimal pulse length is approximately 10 to 100 picoseconds. Thus, picosecond lasers (such as the 795-nm titanium:sapphire laser), which have been shown to be effective in removing traumatic tattoos, are being investigated for application in decorative tattoos.^8,22,23 It is hoped that these lasers, with action that increases phagocytosis or transepidermal elimination, will achieve higher rates of clearance with fewer treatments, less collateral damage, and improved cosmetic outcomes. Currently, only prototypes of this laser are available for removal of decorative tattoos.^1,24

Topical imiquimod 5% cream and tretinoin have been studied in conjunction with laser therapy to remove tattoos. In one animal study in which these agents were applied shortly after tattooing, pigments faded significantly, but inflammation and fibrosis occurred.²⁵ In subsequent small studies in humans, imiquimod cream used in conjunction with Q-switched laser treatment yielded only slight improvements, compared with placebo-enhanced laser treatments.^26,27 Larger studies of imiquimod and similar agents may be warranted.⁵

New tattoo pigments, with documented absorption characteristics within the treatable range of current Q-switched lasers, are in development. One permanent ink made of D&C and USP-grade ingredients, currently available only in black, is reported by the manufacturer to be more easily removed than conventional inks by laser therapy.²⁸ Last year in the United States, only 13 tattoo studios used this novel tattooing pigment.

Tattoo inks in the United States are neither regulated nor approved by the FDA, and manufacturers are not required to monitor the composition of their pigments.^11,29 Additionally, not all states require artists to report infections or other complications associated with a healing tattoo.

Conclusion
Primary care providers must be aware of the benefits and shortcomings of currently available laser treatments for removal of decorative tattoos. With an understanding of the numerous factors that influence the cosmetic outcome of these treatments, clinicians can help patients set realistic goals and avoid complications.

Collaborative efforts among clinicians, researchers, and laser manufacturers should lead to improvements in laser tattoo removal outcomes. 

Between seven and 20 million people in the United States, including adolescents as young as 12, are estimated to have at least one tattoo.^1-3 Perhaps half later regret the decision to acquire a tattoo—for reasons ranging from an acute inflammatory reaction to the perception that having a tattoo might interfere with opportunities for professional advancement.⁴ The ­rising incidence of tattooing may be accompanied by increasing numbers of persons seeking to have decorative tattoos removed. Health care providers need to be aware of the modalities available, along with the risks and benefits of laser tattoo removal.

Tattoo types vary according to etiology, pigment, depth, and purpose. Cosmetic tattoos (“permanent makeup”) often serve to enhance physical features or mask scars; traumatic tattoos result from an injury in which foreign material is embedded in the skin. This article will focus on decorative tattoos and the clinical options for tattooed patients who regret these permanent markings and desire their removal.⁵

Decorative tattoos can be applied professionally or by amateurs, with pigment initially remaining in the superficial dermis; after several years, the pigment may migrate into deeper layers of the skin.⁶ Amateur tattoos are composed of ink or carbon; these pigments are usually less dense than those used by professionals, often making amateur tattoos easier to remove (ie, about five sessions of laser therapy for 90% clearance vs six to 10; see figures below).^1,7

Professional tattoos are composed of organic pigments that vary in particle size but are applied at a uniform depth of needle penetration.⁵ The deposited pigment particles reside mainly in dermal fibroblasts and macrophages, although smaller collections of particles can be found within the interstitial space.

Tattoo Removal Techniques
Older techniques of tattoo removal, including surgical excision, salabrasion, dermabrasion, cryosurgery, and chemical peels, have largely been relinquished. Not only did these methods fail to yield desirable results, but they were associated with adverse effects, including hypopigmentation and scarring.⁵

Although continuous-wave lasers can also cause scarring, quality-switched (Q-switched) lasers have produced more favorable outcomes. The specific color and absorptive characteristics of each tattoo ink will help determine the ideal laser type to be used. In rare cases, patients may be able to contact the responsible artist and inquire about the inks used; information about the absorption spectrum of each pigment could facilitate the treatment plan. Even with this information, however, removal of intricate, colorful tattoos can be a challenge, since several different lasers, used in stages, may be needed.^1,8

The patient’s skin type, too, may affect the response to treatment. Q-switched lasers are effective for all skin types, but complete pigment removal may be more difficult in lighter-skinned patients¹ (ie, Fitzgerald skin types I and II). Similarly, in older tattoos, complete removal may not be possible, since some dermal pigment may have penetrated too deeply to be reached.⁵

Selective Photothermolysis
Laser removal of tattoos is accomplished by selective photothermolysis, a process that was first described by Anderson and Parrish in 1983.^9,10 Photothermolysis targets specific microscopic sites on the skin, with effectiveness depending on the absorption spectrum of each pigment.4 The epidermis, dermis, and skin appendages are only minimally damaged in the process.⁶

Laser therapy modifies the optic properties of the tattoo pigments to be removed. The pigments absorb short laser pulses, which produce a high-intensity light in the pigments that is converted into heat.9 Shock waves shatter the pigment particles, achieving the selective death of the pigment-containing cells. The chemical composition of the pigment is also altered.

Lastly, the cell debris is phagocytized and transported to regional lymph nodes. Although they are hardly visible, some residual, scattered particles remain in the dermis. Only superficial pigment fragments are entirely eliminated during epidermal desquamation as repair is occurring, a development called transepidermal elimination.⁹

To produce the most effective treatment results, the laser wavelength must be absorbed by the ink, the heat should be confined to the target, and adequate energy must be delivered.¹

Clinician–Patient Communication
Since the cosmetic outcome of laser therapy depends on both the laser wavelength and the absorption spectrum of each pigment, it is important for health care providers to understand the optimal wavelengths for each pigment type. They should be prepared to address with their patients the issues of incompatible lasers and resistance of certain pigments to treatment.¹¹

Additionally, although Q-switched lasers are considered the gold standard for tattoo removal, realistic expectations should be established. Patients interested in treatment must be informed at the outset that complete clearance is not guaranteed and that the number of treatments and end result depend on factors that vary from patient to patient.⁴ Ten to 15 sessions, spaced six to eight weeks apart, may be required to achieve a desirable or even acceptable result,9 and the entire process could take a year or longer. The total cost can reach thousands of dollars.¹²

Before initiating laser therapy (or referring the patient for it), the primary care clinician should collect a history regarding the tattoo’s age and etiology, as well as the patient’s tanning habits, in order to recommend the best treatment. As stated earlier, professional tattoos generally require more treatments than amateur tattoos. Distally located tattoos are the most difficult to remove.^1,13

Q-Switched Laser Types
The most common Q-switched lasers are:

• Q-switched ruby laser

• Q-switched Nd:YAG (neo­dymium:yttrium aluminum garnet) laser

• Q-switched alexandrite laser (see table^1,4,6,14).

The choice of laser type is based on several factors, including the presumed absorption spectrum of the target, the desired depth of penetration, the size of the target particle, and the laser’s wavelength and pulse duration.¹¹

Black and India inks absorb broadly across the spectrum. In the case of blue, yellow, or orange pigment, the optimal wavelength for pigment absorption is in an adjacent color. Green pigment absorption spectra vary due to the pigment’s multiple components. The spectra of white, yellow, and “flesh-colored” pigments do not have absorption peaks at the wavelengths of currently used Q-switched lasers; this explains their resistance to removal.¹¹

Use of the Q-switched ruby laser (QSR) is indicated for the removal of black, blue-black, and dark blue pigments. Mixed results have been reported for removal of green and medium blue pigments, and poor results for red, orange, and pale blue. Six treatments at three-week intervals have been reported to yield clearance of 75% or greater in only about 25% of professional, dark-colored tattoos.^1,15

Since this laser’s wavelength (694 nm) is absorbed by melanin, its use may result in transient hypopigmentation, depigmentation, and textural changes.¹

The Q-switched Nd-YAG lasers (with wavelengths of 532 nm or 1064 nm) have a large spot size, concentrated energy densities, high repetition rates, and greater beam diameter, allowing for rapid, effective treatment of closely clustered and deep tattoos.6 Five treatments of red or orange tattoos may achieve 75% clearance in about 60% of patients.¹

The 1064-nm Nd:YAG laser, which has the deepest penetration and carries the least risk for hypopigmentation,¹ is indicated for black and dark blue pigments. It is considered the ideal choice for tattoo removal in dark-skinned patients,^14,16 since its longer wavelength represents a lower affinity for melanin.⁴ The 532-nm Nd:YAG laser is effective for removal of red, yellow, and orange pigments.⁶ Ten or more treatments may be required for 75% clearance of a professional tattoo.¹

Some adverse effects of Nd:YAG laser use include whitening of the skin, with occasional mild pinpoint bleeding. Use of the 532-nm model is associated with purpura, resulting from hemoglobin absorption; this may last from one week to 10 days. The 1064-nm Nd:YAG laser is the least effective for removing bright-colored pigments.^1,17

The Q-switched alexandrite laser is generally used to remove black, blue, and green pigments. Typically, four to 10 sessions are required at intervals of one to two months. Transient hypopigmentation, typically lasting three to four months, occurs in about half of patients, and textural changes have been reported in about 12%.^6,8

The 510-nm, pulsed-dye Q-switched alexandrite laser is reportedly effective in removing red pigment.⁴

Complications, Adverse Effects, and Their Management
Although Q-switched lasers appear quite effective in tattoo removal, their use is not without adverse effects.

Hypopigmentation
The most common chronic adverse effect of laser treatment is hypopigmentation. The risk is high in dark-skinned patients undergoing treatment with the QSR or alexandrite lasers4 and increases in any patient according to the number of treatment sessions. Hypopigmentation occurs in more than 38% of patients treated with QSR lasers and typically lasts for two to six months.⁶

In a 2004 study, Gundogan et al¹⁸ attempted repigmentation with an excimer laser (Nd:YAG/potassium titanyl phosphate–Nd:YAG) in a patient with hypopigmentation following laser tattoo removal. Repigmentation required 40 treatment sessions over 15 months—not a cost-­effective option.⁶ A better solution might be to minimize the risk for hypopigmentation by use of picosecond lasers (see “Better Options on the Horizon?”, below).⁸

Hyperpigmentation
Hyperpigmentation can occur as a result of melanocytes’ increased melanin production in response to laser-generated heat. This effect is usually temporary, but recovery time varies.⁴ The risk of hyperpigmentation depends largely on skin type, with darker-skinned patients (ie, Fitzgerald type III or IV skin) at higher risk.^6,19 Patients at risk for hyperpigmentation should avoid sun exposure before and after laser treatments; UVA/UVB sun blocks are essential if sun exposure cannot be avoided.¹

Hyperpigmentation can also be treated with hydroquinone or fractional photothermolysis.⁶

Paradoxical Darkening of the Tattoo
Paradoxical darkening occurs when the chemical composition of the ink is changed by laser treatment—for example, from rust-colored ferric oxide to jet black ferrous oxide. Similarly, titanium dioxide contained in white ink that is used to brighten other colors can be reduced to titanium oxide or blue Ti3+ in response to laser therapy.¹ Darkening is often difficult to correct, requiring the use of several lasers, including Q-switched or ablative (eg, ultrapulse CO2, pulsed erbium:YAG) lasers.⁹

In order to avoid darkening, a spot test is recommended. The patient should return to the studio, if possible, and have a sample of the pigment to be removed tattooed in the axillary region. After a month, a laser test spot can be performed. If laser treatment fails, the test spot can be removed by surgical excision, and laser treatment abandoned.⁹

Blistering
Blistering can occur as a result of overaggressive laser treatment or inadvertent absorption of laser energy due to the specific pigment. Blisters may be avoided by using a tissue-cooling system, such as a contact chill tip or cryogen spray.⁴ To avoid adverse effects such as wheals, punctate bleeding, blisters, and crusts, a minimum of four weeks between sessions should be maintained. Topical antiseptics can be used to prevent infection.⁶

Allergic Reactions
Tattoos containing metal salts—mercury (red), cadmium (yellow), chrome (green), or cobalt (blue)—may be subject to a local allergic or photoallergic skin reaction.⁶ A preexisting local allergic reaction may be exacerbated by laser treatment, resulting in urticaria or a systemic allergic reaction. The tattoo should be treated with corticosteroids and an allergist consulted.¹ Some providers recommend avoiding laser therapy altogether.

Red is the pigment most often associated with allergic reactions, resulting in nodular, scaly, pruritic areas.¹² Removal of areas of red pigment with the 532-nm Nd:YAG laser can help prevent complications.⁹ Photoallergic reactions most commonly involve cadmium. Affected patients typically report a history of pruritus in the tattoo and raised skin after UV exposure.

Allergic reactions can also be treated with topical or intralesional corticosteroids.¹²

Scarring
Cobblestone texture is a sign of early scarring, usually appearing within two weeks of treatment. The risk for scarring is highest on the chest, outer upper arm, and ankle.¹

The risk is especially great in laser treatment of areas that have been retattooed (ie, a second tattoo applied to cover an older tattoo) because of the high density of pigment and increased laser resistance.⁹ Patients should be asked about the possible presence of a cover-up tattoo, since this may not be detectable on casual inspection.

In a study of Chinese patients who underwent laser removal of professional blue-black tattoos,²⁰ prophylactic use of a gel containing onion extract, heparin, and allantoin had no effect on pigment clearance, but it reduced the rate of scarring, compared with controls. Additional studies are needed to evaluate the gel’s effectiveness in patients with other skin types and with tattoos containing pigments of various colors.²⁰

Topical steroids are sometimes helpful for scarring.¹ More pronounced scarring resulting from laser tattoo removal can be treated with the erbium:YAG laser or pulsed CO2 laser, as well as fractional photothermolysis.⁶

Cutaneous Lymphoma
Two types of red azo dyes have been shown to generate toxic or carcinogenic decomposition products (eg, nitroaniline) under in vitro conditions; whether this occurs in vivo is unknown. Concern has been expressed that laser stimulation of lymphocytes or dendritic cells could lead to cutaneous lymphoma.⁶

Resistance
Certain pigments are resistant to laser treatment, and multicolored tattoos are difficult to treat because of the limited number of laser wavelengths.¹¹ If a tattoo’s nonresponsive area exceeds 10% of its total area, laser treatment should be abandoned for financial reasons.⁹ A smaller resistant area, however, may be treated with ablative lasers (ultrapulse CO2, pulsed erbium:YAG ). This requires numerous sessions, one to three months apart. Aggressive measures, such as attempting to remove all of the pigment in one session, should be avoided, since heavy scarring can ­occur.⁹

Better Options on the Horizon?
Computer simulations have confirmed that laser tattoo removal is photoacoustic and that shorter pulses delivering the same amount of laser energy as longer pulses may be more efficient. According to Ho et al,²¹ the optimal pulse length is approximately 10 to 100 picoseconds. Thus, picosecond lasers (such as the 795-nm titanium:sapphire laser), which have been shown to be effective in removing traumatic tattoos, are being investigated for application in decorative tattoos.^8,22,23 It is hoped that these lasers, with action that increases phagocytosis or transepidermal elimination, will achieve higher rates of clearance with fewer treatments, less collateral damage, and improved cosmetic outcomes. Currently, only prototypes of this laser are available for removal of decorative tattoos.^1,24

Topical imiquimod 5% cream and tretinoin have been studied in conjunction with laser therapy to remove tattoos. In one animal study in which these agents were applied shortly after tattooing, pigments faded significantly, but inflammation and fibrosis occurred.²⁵ In subsequent small studies in humans, imiquimod cream used in conjunction with Q-switched laser treatment yielded only slight improvements, compared with placebo-enhanced laser treatments.^26,27 Larger studies of imiquimod and similar agents may be warranted.⁵

New tattoo pigments, with documented absorption characteristics within the treatable range of current Q-switched lasers, are in development. One permanent ink made of D&C and USP-grade ingredients, currently available only in black, is reported by the manufacturer to be more easily removed than conventional inks by laser therapy.²⁸ Last year in the United States, only 13 tattoo studios used this novel tattooing pigment.

Tattoo inks in the United States are neither regulated nor approved by the FDA, and manufacturers are not required to monitor the composition of their pigments.^11,29 Additionally, not all states require artists to report infections or other complications associated with a healing tattoo.

Conclusion
Primary care providers must be aware of the benefits and shortcomings of currently available laser treatments for removal of decorative tattoos. With an understanding of the numerous factors that influence the cosmetic outcome of these treatments, clinicians can help patients set realistic goals and avoid complications.

Collaborative efforts among clinicians, researchers, and laser manufacturers should lead to improvements in laser tattoo removal outcomes. 

Between seven and 20 million people in the United States, including adolescents as young as 12, are estimated to have at least one tattoo.^1-3 Perhaps half later regret the decision to acquire a tattoo—for reasons ranging from an acute inflammatory reaction to the perception that having a tattoo might interfere with opportunities for professional advancement.⁴ The ­rising incidence of tattooing may be accompanied by increasing numbers of persons seeking to have decorative tattoos removed. Health care providers need to be aware of the modalities available, along with the risks and benefits of laser tattoo removal.

Tattoo types vary according to etiology, pigment, depth, and purpose. Cosmetic tattoos (“permanent makeup”) often serve to enhance physical features or mask scars; traumatic tattoos result from an injury in which foreign material is embedded in the skin. This article will focus on decorative tattoos and the clinical options for tattooed patients who regret these permanent markings and desire their removal.⁵

Decorative tattoos can be applied professionally or by amateurs, with pigment initially remaining in the superficial dermis; after several years, the pigment may migrate into deeper layers of the skin.⁶ Amateur tattoos are composed of ink or carbon; these pigments are usually less dense than those used by professionals, often making amateur tattoos easier to remove (ie, about five sessions of laser therapy for 90% clearance vs six to 10; see figures below).^1,7

Professional tattoos are composed of organic pigments that vary in particle size but are applied at a uniform depth of needle penetration.⁵ The deposited pigment particles reside mainly in dermal fibroblasts and macrophages, although smaller collections of particles can be found within the interstitial space.

Tattoo Removal Techniques
Older techniques of tattoo removal, including surgical excision, salabrasion, dermabrasion, cryosurgery, and chemical peels, have largely been relinquished. Not only did these methods fail to yield desirable results, but they were associated with adverse effects, including hypopigmentation and scarring.⁵

Although continuous-wave lasers can also cause scarring, quality-switched (Q-switched) lasers have produced more favorable outcomes. The specific color and absorptive characteristics of each tattoo ink will help determine the ideal laser type to be used. In rare cases, patients may be able to contact the responsible artist and inquire about the inks used; information about the absorption spectrum of each pigment could facilitate the treatment plan. Even with this information, however, removal of intricate, colorful tattoos can be a challenge, since several different lasers, used in stages, may be needed.^1,8

The patient’s skin type, too, may affect the response to treatment. Q-switched lasers are effective for all skin types, but complete pigment removal may be more difficult in lighter-skinned patients¹ (ie, Fitzgerald skin types I and II). Similarly, in older tattoos, complete removal may not be possible, since some dermal pigment may have penetrated too deeply to be reached.⁵

Selective Photothermolysis
Laser removal of tattoos is accomplished by selective photothermolysis, a process that was first described by Anderson and Parrish in 1983.^9,10 Photothermolysis targets specific microscopic sites on the skin, with effectiveness depending on the absorption spectrum of each pigment.4 The epidermis, dermis, and skin appendages are only minimally damaged in the process.⁶

Laser therapy modifies the optic properties of the tattoo pigments to be removed. The pigments absorb short laser pulses, which produce a high-intensity light in the pigments that is converted into heat.9 Shock waves shatter the pigment particles, achieving the selective death of the pigment-containing cells. The chemical composition of the pigment is also altered.

Lastly, the cell debris is phagocytized and transported to regional lymph nodes. Although they are hardly visible, some residual, scattered particles remain in the dermis. Only superficial pigment fragments are entirely eliminated during epidermal desquamation as repair is occurring, a development called transepidermal elimination.⁹

To produce the most effective treatment results, the laser wavelength must be absorbed by the ink, the heat should be confined to the target, and adequate energy must be delivered.¹

Clinician–Patient Communication
Since the cosmetic outcome of laser therapy depends on both the laser wavelength and the absorption spectrum of each pigment, it is important for health care providers to understand the optimal wavelengths for each pigment type. They should be prepared to address with their patients the issues of incompatible lasers and resistance of certain pigments to treatment.¹¹

Additionally, although Q-switched lasers are considered the gold standard for tattoo removal, realistic expectations should be established. Patients interested in treatment must be informed at the outset that complete clearance is not guaranteed and that the number of treatments and end result depend on factors that vary from patient to patient.⁴ Ten to 15 sessions, spaced six to eight weeks apart, may be required to achieve a desirable or even acceptable result,9 and the entire process could take a year or longer. The total cost can reach thousands of dollars.¹²

Before initiating laser therapy (or referring the patient for it), the primary care clinician should collect a history regarding the tattoo’s age and etiology, as well as the patient’s tanning habits, in order to recommend the best treatment. As stated earlier, professional tattoos generally require more treatments than amateur tattoos. Distally located tattoos are the most difficult to remove.^1,13

Q-Switched Laser Types
The most common Q-switched lasers are:

• Q-switched ruby laser

• Q-switched Nd:YAG (neo­dymium:yttrium aluminum garnet) laser

• Q-switched alexandrite laser (see table^1,4,6,14).

The choice of laser type is based on several factors, including the presumed absorption spectrum of the target, the desired depth of penetration, the size of the target particle, and the laser’s wavelength and pulse duration.¹¹

Black and India inks absorb broadly across the spectrum. In the case of blue, yellow, or orange pigment, the optimal wavelength for pigment absorption is in an adjacent color. Green pigment absorption spectra vary due to the pigment’s multiple components. The spectra of white, yellow, and “flesh-colored” pigments do not have absorption peaks at the wavelengths of currently used Q-switched lasers; this explains their resistance to removal.¹¹

Use of the Q-switched ruby laser (QSR) is indicated for the removal of black, blue-black, and dark blue pigments. Mixed results have been reported for removal of green and medium blue pigments, and poor results for red, orange, and pale blue. Six treatments at three-week intervals have been reported to yield clearance of 75% or greater in only about 25% of professional, dark-colored tattoos.^1,15

Since this laser’s wavelength (694 nm) is absorbed by melanin, its use may result in transient hypopigmentation, depigmentation, and textural changes.¹

The Q-switched Nd-YAG lasers (with wavelengths of 532 nm or 1064 nm) have a large spot size, concentrated energy densities, high repetition rates, and greater beam diameter, allowing for rapid, effective treatment of closely clustered and deep tattoos.6 Five treatments of red or orange tattoos may achieve 75% clearance in about 60% of patients.¹

The 1064-nm Nd:YAG laser, which has the deepest penetration and carries the least risk for hypopigmentation,¹ is indicated for black and dark blue pigments. It is considered the ideal choice for tattoo removal in dark-skinned patients,^14,16 since its longer wavelength represents a lower affinity for melanin.⁴ The 532-nm Nd:YAG laser is effective for removal of red, yellow, and orange pigments.⁶ Ten or more treatments may be required for 75% clearance of a professional tattoo.¹

Some adverse effects of Nd:YAG laser use include whitening of the skin, with occasional mild pinpoint bleeding. Use of the 532-nm model is associated with purpura, resulting from hemoglobin absorption; this may last from one week to 10 days. The 1064-nm Nd:YAG laser is the least effective for removing bright-colored pigments.^1,17

The Q-switched alexandrite laser is generally used to remove black, blue, and green pigments. Typically, four to 10 sessions are required at intervals of one to two months. Transient hypopigmentation, typically lasting three to four months, occurs in about half of patients, and textural changes have been reported in about 12%.^6,8

The 510-nm, pulsed-dye Q-switched alexandrite laser is reportedly effective in removing red pigment.⁴

Complications, Adverse Effects, and Their Management
Although Q-switched lasers appear quite effective in tattoo removal, their use is not without adverse effects.

Hypopigmentation
The most common chronic adverse effect of laser treatment is hypopigmentation. The risk is high in dark-skinned patients undergoing treatment with the QSR or alexandrite lasers4 and increases in any patient according to the number of treatment sessions. Hypopigmentation occurs in more than 38% of patients treated with QSR lasers and typically lasts for two to six months.⁶

In a 2004 study, Gundogan et al¹⁸ attempted repigmentation with an excimer laser (Nd:YAG/potassium titanyl phosphate–Nd:YAG) in a patient with hypopigmentation following laser tattoo removal. Repigmentation required 40 treatment sessions over 15 months—not a cost-­effective option.⁶ A better solution might be to minimize the risk for hypopigmentation by use of picosecond lasers (see “Better Options on the Horizon?”, below).⁸

Hyperpigmentation
Hyperpigmentation can occur as a result of melanocytes’ increased melanin production in response to laser-generated heat. This effect is usually temporary, but recovery time varies.⁴ The risk of hyperpigmentation depends largely on skin type, with darker-skinned patients (ie, Fitzgerald type III or IV skin) at higher risk.^6,19 Patients at risk for hyperpigmentation should avoid sun exposure before and after laser treatments; UVA/UVB sun blocks are essential if sun exposure cannot be avoided.¹

Hyperpigmentation can also be treated with hydroquinone or fractional photothermolysis.⁶

Paradoxical Darkening of the Tattoo
Paradoxical darkening occurs when the chemical composition of the ink is changed by laser treatment—for example, from rust-colored ferric oxide to jet black ferrous oxide. Similarly, titanium dioxide contained in white ink that is used to brighten other colors can be reduced to titanium oxide or blue Ti3+ in response to laser therapy.¹ Darkening is often difficult to correct, requiring the use of several lasers, including Q-switched or ablative (eg, ultrapulse CO2, pulsed erbium:YAG) lasers.⁹

In order to avoid darkening, a spot test is recommended. The patient should return to the studio, if possible, and have a sample of the pigment to be removed tattooed in the axillary region. After a month, a laser test spot can be performed. If laser treatment fails, the test spot can be removed by surgical excision, and laser treatment abandoned.⁹

Blistering
Blistering can occur as a result of overaggressive laser treatment or inadvertent absorption of laser energy due to the specific pigment. Blisters may be avoided by using a tissue-cooling system, such as a contact chill tip or cryogen spray.⁴ To avoid adverse effects such as wheals, punctate bleeding, blisters, and crusts, a minimum of four weeks between sessions should be maintained. Topical antiseptics can be used to prevent infection.⁶

Allergic Reactions
Tattoos containing metal salts—mercury (red), cadmium (yellow), chrome (green), or cobalt (blue)—may be subject to a local allergic or photoallergic skin reaction.⁶ A preexisting local allergic reaction may be exacerbated by laser treatment, resulting in urticaria or a systemic allergic reaction. The tattoo should be treated with corticosteroids and an allergist consulted.¹ Some providers recommend avoiding laser therapy altogether.

Red is the pigment most often associated with allergic reactions, resulting in nodular, scaly, pruritic areas.¹² Removal of areas of red pigment with the 532-nm Nd:YAG laser can help prevent complications.⁹ Photoallergic reactions most commonly involve cadmium. Affected patients typically report a history of pruritus in the tattoo and raised skin after UV exposure.

Allergic reactions can also be treated with topical or intralesional corticosteroids.¹²

Scarring
Cobblestone texture is a sign of early scarring, usually appearing within two weeks of treatment. The risk for scarring is highest on the chest, outer upper arm, and ankle.¹

The risk is especially great in laser treatment of areas that have been retattooed (ie, a second tattoo applied to cover an older tattoo) because of the high density of pigment and increased laser resistance.⁹ Patients should be asked about the possible presence of a cover-up tattoo, since this may not be detectable on casual inspection.

In a study of Chinese patients who underwent laser removal of professional blue-black tattoos,²⁰ prophylactic use of a gel containing onion extract, heparin, and allantoin had no effect on pigment clearance, but it reduced the rate of scarring, compared with controls. Additional studies are needed to evaluate the gel’s effectiveness in patients with other skin types and with tattoos containing pigments of various colors.²⁰

Topical steroids are sometimes helpful for scarring.¹ More pronounced scarring resulting from laser tattoo removal can be treated with the erbium:YAG laser or pulsed CO2 laser, as well as fractional photothermolysis.⁶

Cutaneous Lymphoma
Two types of red azo dyes have been shown to generate toxic or carcinogenic decomposition products (eg, nitroaniline) under in vitro conditions; whether this occurs in vivo is unknown. Concern has been expressed that laser stimulation of lymphocytes or dendritic cells could lead to cutaneous lymphoma.⁶

Resistance
Certain pigments are resistant to laser treatment, and multicolored tattoos are difficult to treat because of the limited number of laser wavelengths.¹¹ If a tattoo’s nonresponsive area exceeds 10% of its total area, laser treatment should be abandoned for financial reasons.⁹ A smaller resistant area, however, may be treated with ablative lasers (ultrapulse CO2, pulsed erbium:YAG ). This requires numerous sessions, one to three months apart. Aggressive measures, such as attempting to remove all of the pigment in one session, should be avoided, since heavy scarring can ­occur.⁹

Better Options on the Horizon?
Computer simulations have confirmed that laser tattoo removal is photoacoustic and that shorter pulses delivering the same amount of laser energy as longer pulses may be more efficient. According to Ho et al,²¹ the optimal pulse length is approximately 10 to 100 picoseconds. Thus, picosecond lasers (such as the 795-nm titanium:sapphire laser), which have been shown to be effective in removing traumatic tattoos, are being investigated for application in decorative tattoos.^8,22,23 It is hoped that these lasers, with action that increases phagocytosis or transepidermal elimination, will achieve higher rates of clearance with fewer treatments, less collateral damage, and improved cosmetic outcomes. Currently, only prototypes of this laser are available for removal of decorative tattoos.^1,24

Topical imiquimod 5% cream and tretinoin have been studied in conjunction with laser therapy to remove tattoos. In one animal study in which these agents were applied shortly after tattooing, pigments faded significantly, but inflammation and fibrosis occurred.²⁵ In subsequent small studies in humans, imiquimod cream used in conjunction with Q-switched laser treatment yielded only slight improvements, compared with placebo-enhanced laser treatments.^26,27 Larger studies of imiquimod and similar agents may be warranted.⁵

New tattoo pigments, with documented absorption characteristics within the treatable range of current Q-switched lasers, are in development. One permanent ink made of D&C and USP-grade ingredients, currently available only in black, is reported by the manufacturer to be more easily removed than conventional inks by laser therapy.²⁸ Last year in the United States, only 13 tattoo studios used this novel tattooing pigment.

Tattoo inks in the United States are neither regulated nor approved by the FDA, and manufacturers are not required to monitor the composition of their pigments.^11,29 Additionally, not all states require artists to report infections or other complications associated with a healing tattoo.

Conclusion
Primary care providers must be aware of the benefits and shortcomings of currently available laser treatments for removal of decorative tattoos. With an understanding of the numerous factors that influence the cosmetic outcome of these treatments, clinicians can help patients set realistic goals and avoid complications.

Collaborative efforts among clinicians, researchers, and laser manufacturers should lead to improvements in laser tattoo removal outcomes. 

Since sildenafil (Viagra) was approved by the US Food and Drug Administration to treat erectile dysfunction, women have been calling for research and development of treatments for female sexual dysfunction.

Despite considerable research documenting improvement in sexual responsiveness, genital sensation, and overall well-being among women who were given testosterone after undergoing bilateral oophorectomy, there remains only one testosterone formulation for women. A combination of synthetic estrogen and methyl testosterone (Estratest; Abbott) is indicated for management of moderate to severe vasomotor symptoms associated with menopause in patients who do not respond to estrogens alone.

In the testing stage from BioSante is LibiGel, a transdermal testosterone product. Acrux is developing Luramist, a daily testosterone spray. Proctor & Gamble’s efforts to gain approval of a testosterone-containing transdermal patch (Intrinsa) for treatment of low libido were unsuccessful, largely because of concern about potential increases in the risks of coronary artery disease and breast cancer. Pivotal trial data did not demonstrate enhanced risk, but the numbers were too small and the timeframe too short (a maximum follow-up of 2 years) to establish an effect, so the FDA asked for long-term studies. In 2006, European regulators approved Intrinsa to treat low sexual desire in surgically menopausal women.

Then there’s flibanserin, which also failed to win approval from an FDA advisory committee after numerous concerns were raised about its safety and efficacy in premenopausal women.

The lack of approved drugs leaves gynecologists and women’s health providers with little to offer our patients who are distressed by sexual dysfunction.

In this Update, I discuss:

• the complexity of female sexual function
• what derailed flibanserin
• recent findings that suggest dehydroepiandrosterone (DHEA) may be beneficial
• recommendations for clinical practice.

As understanding of female sexual dysfunction evolves, so do its labels

The fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) divides female sexual dysfunction into four categories:

• hypoactive sexual desire disorder (HSDD)—a persistent or recurrent deficiency or absence of sexual fantasies and desire for sexual activity
• female sexual arousal disorder—a persistent or recurrent inability to achieve or maintain adequate vaginal lubrication or vulvar swelling (i.e., sexual excitement)
• female orgasmic disorder—persistent or recurrent delay in or absence of orgasm following a normal sexual excitement phase
• dyspareunia—persistent or recurrent genital pain that is associated with sexual intercourse.

These categories were revised in 2003 by an international consensus committee sponsored by the American Urological Association Foundation; arousal disorder has been subdivided into:

• combined arousal disorder—absent feelings of sexual arousal from any type of stimulation, as well as absent or impaired genital sexual arousal (vulvar swelling and vaginal lubrication)
• subjective arousal disorder—absent feelings of sexual excitement and pleasure from any type of stimulation in the presence of genital sexual arousal (vulvar swelling and vaginal lubrication)
• genital arousal disorder—subjective sexual excitement from nongenital sexual stimuli with reduced sensation from genital touching and an absence of genital sexual arousal from any type of sexual stimulation.

These updated definitions will be incorporated into DSM-V, to be published in 2013.

Also likely to change in DSM-V: HSDD and female sexual arousal disorder may be subsumed into a new category, “sexual interest/arousal disorder in women”.¹

The female response to sexual stimuli is complex

The complexity of sexual arousal disorders in women complicates research into the pathophysiology and potential pharmacologic treatment of these conditions. Conflicting evidence for any benefit of the phosphodiesterase type-5 (PDE5) inhibitors, such as sildenafil, in the treatment of sexual dysfunction in women likely arises from a lack of precision in defining the conditions in which and patients for whom these interventions are appropriate.

Functional magnetic resonance imaging (MRI) studies of men and women reveal differences in areas of brain activity related to sexual arousal. The neurophysiology of sexual desire and response is complex, involving multiple neurotransmitters, peptides, and hormones as well as multiple structural regions within the brain. Dopamine, norepinephrine, melanocortin, oxytocin, and serotonin (at some of its receptors) promote sexual activity, whereas prolactin, gamma amino butyric acid (GABA), and serotonin (at most of its receptors) are inhibitory.

In animal studies, both an increase in dopamine and a change in social environment can trigger increased sexual behavior. In women, a dopaminergic drug such as buproprion may increase arousability and pleasure—but so can a new partner.

All these bits of the “big picture” continue to complicate research in female sexual function.

It is imperative that we begin to understand the nuances of our patients’ sexual problems if we are to offer effective suggestions for treatment and management. Objectively determined genital arousal disorder very likely derives from neurovascular causes and is likely to respond to PDE5 inhibitors, but subjective arousal disorder with normal vulvar and vaginal engorgement and lubrication is not likely to respond to these agents.

This is the state of our basic science knowledge in 2010. What’s out there and on the horizon for us to offer our patients?

Flibanserin gets an unequivocal thumbs down

Phase-3 Trial 511.71. A twenty-four week, randomized, double-blind, placebo-controlled, safety and efficacy trial of flibanserin 50 milligrams every evening and flibanserin 100 mg every evening in women with hypoactive sexual desire disorder in North America. NCT00360529.

Phase-3 Trial 511.75. Best tolerability: 50 mg twice daily versus 100 mg in the evening versus 25 mg twice daily versus placebo in younger women in North America. NCT00360555.

Flibanserin is a 5HT 1A agonist, 2A antagonist, and weak dopamine agonist. It was originally studied as a treatment for major depressive disorder. In phase-2 trials, it was ineffective for management of depression but superior to placebo and an active comparator in improving sex drive (based on validated questionnaires). These results formed the basis for studying flibanserin as a treatment for HSDD. More than 5,000 women have been involved in phase-2 and phase-3 trials in the United States, Canada, and Europe.

Following FDA guidance for sponsors developing treatments for HSDD, drug maker Boehringer Ingelheim defined the primary endpoints for the pivotal trials as an increase in the number of sexually satisfying events (SSEs) and sexual desire, as measured by a daily diary. Sexual events included:

• genital touching by the partner
• masturbation
• oral sex
• intercourse
• orgasm.

Sexual desire was rated daily by the participants using an eDiary.

In North American phase-3 trials, 2,462 premenopausal women with acquired HSDD in stable, monogamous, functionally heterosexual, communicative relationships for at least 1 year were enrolled. Comorbid arousal and orgasmic disorders were allowed if they were secondary to decreased desire. Mean age of the participants was 35 to 36 years, and they were predominantly white, highly educated women in long-term relationships.

Two important exclusions worth noting:

• women who had depression, breast or other cancers (except skin cancer), or any major medical condition
• women who were taking any of the medications on a five-page list of excluded drugs (due to metabolism with the enzyme cytochrome P3A4).

Once they were screened, women completed a 4-week baseline assessment of sexual activity and desire, followed by a 24-week study period. They were randomized to receive 50 mg or 100 mg of flibanserin or placebo daily. Improvements in sexual function, compared with the 4-week baseline, had to be both statistically and clinically significant for the studies to be successful.

Flibanserin’s effects were clinically unimpressive

At a daily dosage of 100 mg, flibanserin was associated with a significant increase in the number of SSEs, compared with placebo. However, the co-primary endpoint of an increase in desire, as assessed by the eDiary, was not achieved in the active treatment group. Women who took flibanserin had a response rate of 30% to 40%, compared with 15% to 30% for women who took placebo. Although this difference was significant, it was clinically unimpressive, with fewer than 50% of participants experiencing significant improvement (TABLE 1).

TABLE 1

Flibanserin increased the mean number of sexually satisfying events—but improvement was modest

Frequency of side effects is troubling

Among women who took the active drug, 34.6% discontinued the medication because of side effects, compared with 6.8% of women who took placebo. Most common side effects (and their incidence) were:

• nausea (12%)
• dizziness (11%)
• fatigue (11%)
• daytime somnolence (9.5%)
• anxiety (2%).

In the healthy study population, no major safety issues were associated with flibanserin. However, concomitant use of alcohol, a selective serotonin reuptake inhibitor (SSRI) or serotonin-norepinephrine reuptake inhibitor (SNRI), or a triptan was associated with a marked increase in side effects.

In addition, women who were predisposed to depression or suicidal ideation were more likely to develop suicidal tendencies while taking flibanserin, compared with placebo.

Given the long list of prohibited medications (CYP3A4 promoters or inhibitors), many of which are in widespread use, and given the lack of pharmacodynamic assessment by the sponsor of circulating levels of active drug if used with any of these medications, FDA reviewers and advisory panel members grew concerned about the potential for major side effects if flibanserin were to be released for commercial use.

Ultimately, the FDA advisory panel voted unanimously to withhold approval of flibanserin for treatment of HSDD in premenopausal women but encouraged the company to continue studies in postmenopausal women. Recruitment is under way for NCT00996372.

Intravaginal DHEA improves postmenopausal sexual function

Labrie F, Archer D, Bouchard C, et al. Effect of intravaginal dehydroepiandrosterone (Prasterone) on libido and sexual dysfunction in postmenopausal women. Menopause. 2009;16(5):923–931.

DHEA has been studied as a treatment for female sexual dysfunction in postmenopausal women, in whom it acts as a precursor for both estrogen and androgen synthesis. In this study by Labrie and colleagues, all aspects of female sexual function—desire, arousal, orgasm, and pain—improved significantly with intravaginal DHEA (TABLE 2).

This phase-3, multicenter, placebo-controlled, randomized clinical trial of 216 participants—50 in each arm—randomized women to placebo or 3.25 mg, 6.5 mg, or 13 mg of DHEA daily. Median age of participants was 58.

The study began with a 4-week baseline screening phase, followed by 12 weeks of placebo or active treatment. Women were enrolled if they were postmenopausal and experienced vaginal dryness or vulvar or vaginal irritation or pain. Most women had moderate to severe symptoms.

Topical or systemic hormone therapy was prohibited, and women who had preexisting cancer (except skin cancer) or endometrial hyperplasia were excluded. The primary endpoint was improvement in the four domains of sexual dysfunction.

Although women were not initially selected for this trial based on measures of personal distress related to their sexual dysfunction (marked distress or interpersonal difficulty is required by DSM-IV for a diagnosis), approximately 50% indicated a desire for improvement on the intake questionnaire. Women were not excluded from this study if they were taking other medications known to affect sexual function, with the exception of systemic or topical hormonal treatment.

The robust results in this study were achieved without increasing circulating levels of estrogen, testosterone, or DHEA beyond the normal postmenopausal range.

TABLE 2

Women using intravaginal DHEA experienced improvement in all four domains of female sexual function

What can we offer to our patients?

Female sexual dysfunction is more difficult to categorize and certainly more difficult to measure scientifically than male sexual dysfunction. The distinction between desire, arousal, and pain disorders in women is easily blurred. Certainly, the ability to declare success in clinical trials is straightforward and unequivocal for men. Not so for women.

Female sexual dysfunction that causes distress for our patients is not uncommon. It is a source of frustration for our patients and for us as providers. For now, in the absence of a “little pink pill,” we can offer:

• techniques to eliminate pain such as topical estrogen for atrophy and physical therapy and biofeedback for secondary vaginismus
• adjustment of medications that may thwart sexual desire, arousal, or orgasm, such as SSRIs and antihypertensive regimens
• counseling and psychotherapy to help focus the relationship back to intimacy and sexuality. Remember that just enrolling in the clinical trials I described and paying attention to sexuality increased measures of female sexual function by as much as 30%
• encouragement about a healthy lifestyle, such as regular exercise, which increases blood flow to the genitalia—as does discontinuation of smoking. Sildenafil may have a role in managing SSRI-induced or vascular disease–related genital arousal disorder.²

Stay tuned

Despite recent disappointments in pharmacotherapy, our awareness about and knowledge of female sexual dysfunction continues to grow. Safe and effective treatments for HSDD and the other conditions affecting women’s sexual function are in the pipeline.

We want to hear from you! Tell us what you think.

Since sildenafil (Viagra) was approved by the US Food and Drug Administration to treat erectile dysfunction, women have been calling for research and development of treatments for female sexual dysfunction.

Despite considerable research documenting improvement in sexual responsiveness, genital sensation, and overall well-being among women who were given testosterone after undergoing bilateral oophorectomy, there remains only one testosterone formulation for women. A combination of synthetic estrogen and methyl testosterone (Estratest; Abbott) is indicated for management of moderate to severe vasomotor symptoms associated with menopause in patients who do not respond to estrogens alone.

In the testing stage from BioSante is LibiGel, a transdermal testosterone product. Acrux is developing Luramist, a daily testosterone spray. Proctor & Gamble’s efforts to gain approval of a testosterone-containing transdermal patch (Intrinsa) for treatment of low libido were unsuccessful, largely because of concern about potential increases in the risks of coronary artery disease and breast cancer. Pivotal trial data did not demonstrate enhanced risk, but the numbers were too small and the timeframe too short (a maximum follow-up of 2 years) to establish an effect, so the FDA asked for long-term studies. In 2006, European regulators approved Intrinsa to treat low sexual desire in surgically menopausal women.

Then there’s flibanserin, which also failed to win approval from an FDA advisory committee after numerous concerns were raised about its safety and efficacy in premenopausal women.

The lack of approved drugs leaves gynecologists and women’s health providers with little to offer our patients who are distressed by sexual dysfunction.

In this Update, I discuss:

• the complexity of female sexual function
• what derailed flibanserin
• recent findings that suggest dehydroepiandrosterone (DHEA) may be beneficial
• recommendations for clinical practice.

As understanding of female sexual dysfunction evolves, so do its labels

The fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) divides female sexual dysfunction into four categories:

• hypoactive sexual desire disorder (HSDD)—a persistent or recurrent deficiency or absence of sexual fantasies and desire for sexual activity
• female sexual arousal disorder—a persistent or recurrent inability to achieve or maintain adequate vaginal lubrication or vulvar swelling (i.e., sexual excitement)
• female orgasmic disorder—persistent or recurrent delay in or absence of orgasm following a normal sexual excitement phase
• dyspareunia—persistent or recurrent genital pain that is associated with sexual intercourse.

These categories were revised in 2003 by an international consensus committee sponsored by the American Urological Association Foundation; arousal disorder has been subdivided into:

• combined arousal disorder—absent feelings of sexual arousal from any type of stimulation, as well as absent or impaired genital sexual arousal (vulvar swelling and vaginal lubrication)
• subjective arousal disorder—absent feelings of sexual excitement and pleasure from any type of stimulation in the presence of genital sexual arousal (vulvar swelling and vaginal lubrication)
• genital arousal disorder—subjective sexual excitement from nongenital sexual stimuli with reduced sensation from genital touching and an absence of genital sexual arousal from any type of sexual stimulation.

These updated definitions will be incorporated into DSM-V, to be published in 2013.

Also likely to change in DSM-V: HSDD and female sexual arousal disorder may be subsumed into a new category, “sexual interest/arousal disorder in women”.¹

The female response to sexual stimuli is complex

The complexity of sexual arousal disorders in women complicates research into the pathophysiology and potential pharmacologic treatment of these conditions. Conflicting evidence for any benefit of the phosphodiesterase type-5 (PDE5) inhibitors, such as sildenafil, in the treatment of sexual dysfunction in women likely arises from a lack of precision in defining the conditions in which and patients for whom these interventions are appropriate.

Functional magnetic resonance imaging (MRI) studies of men and women reveal differences in areas of brain activity related to sexual arousal. The neurophysiology of sexual desire and response is complex, involving multiple neurotransmitters, peptides, and hormones as well as multiple structural regions within the brain. Dopamine, norepinephrine, melanocortin, oxytocin, and serotonin (at some of its receptors) promote sexual activity, whereas prolactin, gamma amino butyric acid (GABA), and serotonin (at most of its receptors) are inhibitory.

In animal studies, both an increase in dopamine and a change in social environment can trigger increased sexual behavior. In women, a dopaminergic drug such as buproprion may increase arousability and pleasure—but so can a new partner.

All these bits of the “big picture” continue to complicate research in female sexual function.

It is imperative that we begin to understand the nuances of our patients’ sexual problems if we are to offer effective suggestions for treatment and management. Objectively determined genital arousal disorder very likely derives from neurovascular causes and is likely to respond to PDE5 inhibitors, but subjective arousal disorder with normal vulvar and vaginal engorgement and lubrication is not likely to respond to these agents.

This is the state of our basic science knowledge in 2010. What’s out there and on the horizon for us to offer our patients?

Flibanserin gets an unequivocal thumbs down

Phase-3 Trial 511.71. A twenty-four week, randomized, double-blind, placebo-controlled, safety and efficacy trial of flibanserin 50 milligrams every evening and flibanserin 100 mg every evening in women with hypoactive sexual desire disorder in North America. NCT00360529.

Phase-3 Trial 511.75. Best tolerability: 50 mg twice daily versus 100 mg in the evening versus 25 mg twice daily versus placebo in younger women in North America. NCT00360555.

Flibanserin is a 5HT 1A agonist, 2A antagonist, and weak dopamine agonist. It was originally studied as a treatment for major depressive disorder. In phase-2 trials, it was ineffective for management of depression but superior to placebo and an active comparator in improving sex drive (based on validated questionnaires). These results formed the basis for studying flibanserin as a treatment for HSDD. More than 5,000 women have been involved in phase-2 and phase-3 trials in the United States, Canada, and Europe.

Following FDA guidance for sponsors developing treatments for HSDD, drug maker Boehringer Ingelheim defined the primary endpoints for the pivotal trials as an increase in the number of sexually satisfying events (SSEs) and sexual desire, as measured by a daily diary. Sexual events included:

• genital touching by the partner
• masturbation
• oral sex
• intercourse
• orgasm.

Sexual desire was rated daily by the participants using an eDiary.

In North American phase-3 trials, 2,462 premenopausal women with acquired HSDD in stable, monogamous, functionally heterosexual, communicative relationships for at least 1 year were enrolled. Comorbid arousal and orgasmic disorders were allowed if they were secondary to decreased desire. Mean age of the participants was 35 to 36 years, and they were predominantly white, highly educated women in long-term relationships.

Two important exclusions worth noting:

• women who had depression, breast or other cancers (except skin cancer), or any major medical condition
• women who were taking any of the medications on a five-page list of excluded drugs (due to metabolism with the enzyme cytochrome P3A4).

Once they were screened, women completed a 4-week baseline assessment of sexual activity and desire, followed by a 24-week study period. They were randomized to receive 50 mg or 100 mg of flibanserin or placebo daily. Improvements in sexual function, compared with the 4-week baseline, had to be both statistically and clinically significant for the studies to be successful.

Flibanserin’s effects were clinically unimpressive

At a daily dosage of 100 mg, flibanserin was associated with a significant increase in the number of SSEs, compared with placebo. However, the co-primary endpoint of an increase in desire, as assessed by the eDiary, was not achieved in the active treatment group. Women who took flibanserin had a response rate of 30% to 40%, compared with 15% to 30% for women who took placebo. Although this difference was significant, it was clinically unimpressive, with fewer than 50% of participants experiencing significant improvement (TABLE 1).

TABLE 1

Flibanserin increased the mean number of sexually satisfying events—but improvement was modest

Frequency of side effects is troubling

Among women who took the active drug, 34.6% discontinued the medication because of side effects, compared with 6.8% of women who took placebo. Most common side effects (and their incidence) were:

• nausea (12%)
• dizziness (11%)
• fatigue (11%)
• daytime somnolence (9.5%)
• anxiety (2%).

In the healthy study population, no major safety issues were associated with flibanserin. However, concomitant use of alcohol, a selective serotonin reuptake inhibitor (SSRI) or serotonin-norepinephrine reuptake inhibitor (SNRI), or a triptan was associated with a marked increase in side effects.

In addition, women who were predisposed to depression or suicidal ideation were more likely to develop suicidal tendencies while taking flibanserin, compared with placebo.

Given the long list of prohibited medications (CYP3A4 promoters or inhibitors), many of which are in widespread use, and given the lack of pharmacodynamic assessment by the sponsor of circulating levels of active drug if used with any of these medications, FDA reviewers and advisory panel members grew concerned about the potential for major side effects if flibanserin were to be released for commercial use.

Ultimately, the FDA advisory panel voted unanimously to withhold approval of flibanserin for treatment of HSDD in premenopausal women but encouraged the company to continue studies in postmenopausal women. Recruitment is under way for NCT00996372.

Intravaginal DHEA improves postmenopausal sexual function

Labrie F, Archer D, Bouchard C, et al. Effect of intravaginal dehydroepiandrosterone (Prasterone) on libido and sexual dysfunction in postmenopausal women. Menopause. 2009;16(5):923–931.

DHEA has been studied as a treatment for female sexual dysfunction in postmenopausal women, in whom it acts as a precursor for both estrogen and androgen synthesis. In this study by Labrie and colleagues, all aspects of female sexual function—desire, arousal, orgasm, and pain—improved significantly with intravaginal DHEA (TABLE 2).

This phase-3, multicenter, placebo-controlled, randomized clinical trial of 216 participants—50 in each arm—randomized women to placebo or 3.25 mg, 6.5 mg, or 13 mg of DHEA daily. Median age of participants was 58.

The study began with a 4-week baseline screening phase, followed by 12 weeks of placebo or active treatment. Women were enrolled if they were postmenopausal and experienced vaginal dryness or vulvar or vaginal irritation or pain. Most women had moderate to severe symptoms.

Topical or systemic hormone therapy was prohibited, and women who had preexisting cancer (except skin cancer) or endometrial hyperplasia were excluded. The primary endpoint was improvement in the four domains of sexual dysfunction.

Although women were not initially selected for this trial based on measures of personal distress related to their sexual dysfunction (marked distress or interpersonal difficulty is required by DSM-IV for a diagnosis), approximately 50% indicated a desire for improvement on the intake questionnaire. Women were not excluded from this study if they were taking other medications known to affect sexual function, with the exception of systemic or topical hormonal treatment.

The robust results in this study were achieved without increasing circulating levels of estrogen, testosterone, or DHEA beyond the normal postmenopausal range.

TABLE 2

Women using intravaginal DHEA experienced improvement in all four domains of female sexual function

What can we offer to our patients?

Female sexual dysfunction is more difficult to categorize and certainly more difficult to measure scientifically than male sexual dysfunction. The distinction between desire, arousal, and pain disorders in women is easily blurred. Certainly, the ability to declare success in clinical trials is straightforward and unequivocal for men. Not so for women.

Female sexual dysfunction that causes distress for our patients is not uncommon. It is a source of frustration for our patients and for us as providers. For now, in the absence of a “little pink pill,” we can offer:

• techniques to eliminate pain such as topical estrogen for atrophy and physical therapy and biofeedback for secondary vaginismus
• adjustment of medications that may thwart sexual desire, arousal, or orgasm, such as SSRIs and antihypertensive regimens
• counseling and psychotherapy to help focus the relationship back to intimacy and sexuality. Remember that just enrolling in the clinical trials I described and paying attention to sexuality increased measures of female sexual function by as much as 30%
• encouragement about a healthy lifestyle, such as regular exercise, which increases blood flow to the genitalia—as does discontinuation of smoking. Sildenafil may have a role in managing SSRI-induced or vascular disease–related genital arousal disorder.²

Stay tuned

Despite recent disappointments in pharmacotherapy, our awareness about and knowledge of female sexual dysfunction continues to grow. Safe and effective treatments for HSDD and the other conditions affecting women’s sexual function are in the pipeline.

We want to hear from you! Tell us what you think.

Since sildenafil (Viagra) was approved by the US Food and Drug Administration to treat erectile dysfunction, women have been calling for research and development of treatments for female sexual dysfunction.

Despite considerable research documenting improvement in sexual responsiveness, genital sensation, and overall well-being among women who were given testosterone after undergoing bilateral oophorectomy, there remains only one testosterone formulation for women. A combination of synthetic estrogen and methyl testosterone (Estratest; Abbott) is indicated for management of moderate to severe vasomotor symptoms associated with menopause in patients who do not respond to estrogens alone.

In the testing stage from BioSante is LibiGel, a transdermal testosterone product. Acrux is developing Luramist, a daily testosterone spray. Proctor & Gamble’s efforts to gain approval of a testosterone-containing transdermal patch (Intrinsa) for treatment of low libido were unsuccessful, largely because of concern about potential increases in the risks of coronary artery disease and breast cancer. Pivotal trial data did not demonstrate enhanced risk, but the numbers were too small and the timeframe too short (a maximum follow-up of 2 years) to establish an effect, so the FDA asked for long-term studies. In 2006, European regulators approved Intrinsa to treat low sexual desire in surgically menopausal women.

Then there’s flibanserin, which also failed to win approval from an FDA advisory committee after numerous concerns were raised about its safety and efficacy in premenopausal women.

The lack of approved drugs leaves gynecologists and women’s health providers with little to offer our patients who are distressed by sexual dysfunction.

In this Update, I discuss:

• the complexity of female sexual function
• what derailed flibanserin
• recent findings that suggest dehydroepiandrosterone (DHEA) may be beneficial
• recommendations for clinical practice.

As understanding of female sexual dysfunction evolves, so do its labels

The fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) divides female sexual dysfunction into four categories:

• hypoactive sexual desire disorder (HSDD)—a persistent or recurrent deficiency or absence of sexual fantasies and desire for sexual activity
• female sexual arousal disorder—a persistent or recurrent inability to achieve or maintain adequate vaginal lubrication or vulvar swelling (i.e., sexual excitement)
• female orgasmic disorder—persistent or recurrent delay in or absence of orgasm following a normal sexual excitement phase
• dyspareunia—persistent or recurrent genital pain that is associated with sexual intercourse.

These categories were revised in 2003 by an international consensus committee sponsored by the American Urological Association Foundation; arousal disorder has been subdivided into:

• combined arousal disorder—absent feelings of sexual arousal from any type of stimulation, as well as absent or impaired genital sexual arousal (vulvar swelling and vaginal lubrication)
• subjective arousal disorder—absent feelings of sexual excitement and pleasure from any type of stimulation in the presence of genital sexual arousal (vulvar swelling and vaginal lubrication)
• genital arousal disorder—subjective sexual excitement from nongenital sexual stimuli with reduced sensation from genital touching and an absence of genital sexual arousal from any type of sexual stimulation.

These updated definitions will be incorporated into DSM-V, to be published in 2013.

Also likely to change in DSM-V: HSDD and female sexual arousal disorder may be subsumed into a new category, “sexual interest/arousal disorder in women”.¹

The female response to sexual stimuli is complex

The complexity of sexual arousal disorders in women complicates research into the pathophysiology and potential pharmacologic treatment of these conditions. Conflicting evidence for any benefit of the phosphodiesterase type-5 (PDE5) inhibitors, such as sildenafil, in the treatment of sexual dysfunction in women likely arises from a lack of precision in defining the conditions in which and patients for whom these interventions are appropriate.

Functional magnetic resonance imaging (MRI) studies of men and women reveal differences in areas of brain activity related to sexual arousal. The neurophysiology of sexual desire and response is complex, involving multiple neurotransmitters, peptides, and hormones as well as multiple structural regions within the brain. Dopamine, norepinephrine, melanocortin, oxytocin, and serotonin (at some of its receptors) promote sexual activity, whereas prolactin, gamma amino butyric acid (GABA), and serotonin (at most of its receptors) are inhibitory.

In animal studies, both an increase in dopamine and a change in social environment can trigger increased sexual behavior. In women, a dopaminergic drug such as buproprion may increase arousability and pleasure—but so can a new partner.

All these bits of the “big picture” continue to complicate research in female sexual function.

It is imperative that we begin to understand the nuances of our patients’ sexual problems if we are to offer effective suggestions for treatment and management. Objectively determined genital arousal disorder very likely derives from neurovascular causes and is likely to respond to PDE5 inhibitors, but subjective arousal disorder with normal vulvar and vaginal engorgement and lubrication is not likely to respond to these agents.

This is the state of our basic science knowledge in 2010. What’s out there and on the horizon for us to offer our patients?

Flibanserin gets an unequivocal thumbs down

Phase-3 Trial 511.71. A twenty-four week, randomized, double-blind, placebo-controlled, safety and efficacy trial of flibanserin 50 milligrams every evening and flibanserin 100 mg every evening in women with hypoactive sexual desire disorder in North America. NCT00360529.

Phase-3 Trial 511.75. Best tolerability: 50 mg twice daily versus 100 mg in the evening versus 25 mg twice daily versus placebo in younger women in North America. NCT00360555.

Flibanserin is a 5HT 1A agonist, 2A antagonist, and weak dopamine agonist. It was originally studied as a treatment for major depressive disorder. In phase-2 trials, it was ineffective for management of depression but superior to placebo and an active comparator in improving sex drive (based on validated questionnaires). These results formed the basis for studying flibanserin as a treatment for HSDD. More than 5,000 women have been involved in phase-2 and phase-3 trials in the United States, Canada, and Europe.

Following FDA guidance for sponsors developing treatments for HSDD, drug maker Boehringer Ingelheim defined the primary endpoints for the pivotal trials as an increase in the number of sexually satisfying events (SSEs) and sexual desire, as measured by a daily diary. Sexual events included:

• genital touching by the partner
• masturbation
• oral sex
• intercourse
• orgasm.

Sexual desire was rated daily by the participants using an eDiary.

In North American phase-3 trials, 2,462 premenopausal women with acquired HSDD in stable, monogamous, functionally heterosexual, communicative relationships for at least 1 year were enrolled. Comorbid arousal and orgasmic disorders were allowed if they were secondary to decreased desire. Mean age of the participants was 35 to 36 years, and they were predominantly white, highly educated women in long-term relationships.

Two important exclusions worth noting:

• women who had depression, breast or other cancers (except skin cancer), or any major medical condition
• women who were taking any of the medications on a five-page list of excluded drugs (due to metabolism with the enzyme cytochrome P3A4).

Once they were screened, women completed a 4-week baseline assessment of sexual activity and desire, followed by a 24-week study period. They were randomized to receive 50 mg or 100 mg of flibanserin or placebo daily. Improvements in sexual function, compared with the 4-week baseline, had to be both statistically and clinically significant for the studies to be successful.

Flibanserin’s effects were clinically unimpressive

At a daily dosage of 100 mg, flibanserin was associated with a significant increase in the number of SSEs, compared with placebo. However, the co-primary endpoint of an increase in desire, as assessed by the eDiary, was not achieved in the active treatment group. Women who took flibanserin had a response rate of 30% to 40%, compared with 15% to 30% for women who took placebo. Although this difference was significant, it was clinically unimpressive, with fewer than 50% of participants experiencing significant improvement (TABLE 1).

TABLE 1

Flibanserin increased the mean number of sexually satisfying events—but improvement was modest

Frequency of side effects is troubling

Among women who took the active drug, 34.6% discontinued the medication because of side effects, compared with 6.8% of women who took placebo. Most common side effects (and their incidence) were:

• nausea (12%)
• dizziness (11%)
• fatigue (11%)
• daytime somnolence (9.5%)
• anxiety (2%).

In the healthy study population, no major safety issues were associated with flibanserin. However, concomitant use of alcohol, a selective serotonin reuptake inhibitor (SSRI) or serotonin-norepinephrine reuptake inhibitor (SNRI), or a triptan was associated with a marked increase in side effects.

In addition, women who were predisposed to depression or suicidal ideation were more likely to develop suicidal tendencies while taking flibanserin, compared with placebo.

Given the long list of prohibited medications (CYP3A4 promoters or inhibitors), many of which are in widespread use, and given the lack of pharmacodynamic assessment by the sponsor of circulating levels of active drug if used with any of these medications, FDA reviewers and advisory panel members grew concerned about the potential for major side effects if flibanserin were to be released for commercial use.

Ultimately, the FDA advisory panel voted unanimously to withhold approval of flibanserin for treatment of HSDD in premenopausal women but encouraged the company to continue studies in postmenopausal women. Recruitment is under way for NCT00996372.

Intravaginal DHEA improves postmenopausal sexual function

Labrie F, Archer D, Bouchard C, et al. Effect of intravaginal dehydroepiandrosterone (Prasterone) on libido and sexual dysfunction in postmenopausal women. Menopause. 2009;16(5):923–931.

DHEA has been studied as a treatment for female sexual dysfunction in postmenopausal women, in whom it acts as a precursor for both estrogen and androgen synthesis. In this study by Labrie and colleagues, all aspects of female sexual function—desire, arousal, orgasm, and pain—improved significantly with intravaginal DHEA (TABLE 2).

This phase-3, multicenter, placebo-controlled, randomized clinical trial of 216 participants—50 in each arm—randomized women to placebo or 3.25 mg, 6.5 mg, or 13 mg of DHEA daily. Median age of participants was 58.

The study began with a 4-week baseline screening phase, followed by 12 weeks of placebo or active treatment. Women were enrolled if they were postmenopausal and experienced vaginal dryness or vulvar or vaginal irritation or pain. Most women had moderate to severe symptoms.

Topical or systemic hormone therapy was prohibited, and women who had preexisting cancer (except skin cancer) or endometrial hyperplasia were excluded. The primary endpoint was improvement in the four domains of sexual dysfunction.

Although women were not initially selected for this trial based on measures of personal distress related to their sexual dysfunction (marked distress or interpersonal difficulty is required by DSM-IV for a diagnosis), approximately 50% indicated a desire for improvement on the intake questionnaire. Women were not excluded from this study if they were taking other medications known to affect sexual function, with the exception of systemic or topical hormonal treatment.

The robust results in this study were achieved without increasing circulating levels of estrogen, testosterone, or DHEA beyond the normal postmenopausal range.

TABLE 2

Women using intravaginal DHEA experienced improvement in all four domains of female sexual function

What can we offer to our patients?

Female sexual dysfunction is more difficult to categorize and certainly more difficult to measure scientifically than male sexual dysfunction. The distinction between desire, arousal, and pain disorders in women is easily blurred. Certainly, the ability to declare success in clinical trials is straightforward and unequivocal for men. Not so for women.

Female sexual dysfunction that causes distress for our patients is not uncommon. It is a source of frustration for our patients and for us as providers. For now, in the absence of a “little pink pill,” we can offer:

• techniques to eliminate pain such as topical estrogen for atrophy and physical therapy and biofeedback for secondary vaginismus
• adjustment of medications that may thwart sexual desire, arousal, or orgasm, such as SSRIs and antihypertensive regimens
• counseling and psychotherapy to help focus the relationship back to intimacy and sexuality. Remember that just enrolling in the clinical trials I described and paying attention to sexuality increased measures of female sexual function by as much as 30%
• encouragement about a healthy lifestyle, such as regular exercise, which increases blood flow to the genitalia—as does discontinuation of smoking. Sildenafil may have a role in managing SSRI-induced or vascular disease–related genital arousal disorder.²

Stay tuned

Despite recent disappointments in pharmacotherapy, our awareness about and knowledge of female sexual dysfunction continues to grow. Safe and effective treatments for HSDD and the other conditions affecting women’s sexual function are in the pipeline.

We want to hear from you! Tell us what you think.

No doubt about it: Scanning the adnexae is the most challenging task in gynecologic ultrasonography (US). There are many reasons for the difficulty, but probably none more important than the fact that you are expected to reach a conclusion about what you see—or at least narrow the differential diagnosis.

Some ultrasound laboratories try to hedge their bets, sending the referring physician a report that is nothing more than an exhaustive differential diagnosis, similar to what we see in textbooks. Such a list is useless to a referring clinician, who has probably already considered most of the possibilities and involved the lab to help narrow them down. Labs that send such reports are usually trying to protect themselves from litigation—typically involving cases in which ovarian cancer was missed—or attempting to accomplish a “self-referral” by encouraging further imaging.¹

The referring physician is not perfect, either. In our practice, we often receive reports like the following terse description:

A complex cyst was seen in the adnexa. Ovarian malignancy cannot be ruled out.

That’s it. No description of the actual sonographic characteristics. No Doppler velocity flow studies. Yet, the few remarks include a mention of malignancy, and the provider often suggests that “additional imaging such as CT and MRI should be considered.”

When we scrutinize the sonographic images upon which these reports are based, we often discover a corpus luteum, cystic teratoma, benign cystadenoma, endometrioma, or, even, a simple cyst.

The need for competency is compelling

Now that gynecologic US has matured as a field in its own right, the referring physician should expect much more from a laboratory’s pelvic scan than a long recitation of potential diagnoses. And the lab should expect more basic information from the referring provider.

That is the primary reason for this four-part series—to help you identify some of the most prevalent adnexal masses, so that you can exclude cases that are no cause for concern, such as a corpus luteum, and refer patients who really do need additional imaging and expertise, providing as much information in the process as you can.

In Part 1 of the series, we introduce you to basic concepts, recommend equipment, and step you through numerous fundamental scans. Part 2 will focus on nonneoplastic ovarian masses, Part 3 on ovarian neoplasms, and Part 4 on tubal entities such as ectopic pregnancy and torsion.

As much as possible, we educate you by providing actual scans that represent real cases, pointing out the elements that should grab your attention. After all, a picture paints a thousand words.

Ultrasound reveals the polycystic nature of a patient’s ovary. The hilus is prominently hyperechoic.

A few fundamental practices enhance consistency and thoroughness

Before we shift our focus to scanning techniques and interpretation of images, we’d like to offer several basic pointers.

Establish, and document, the hormonal milieu. One of the most important requirements of US imaging, particularly during the reproductive years, is determining and documenting the date of the patient’s last menstrual period (LMP). The reason? Physiologic and pathologic processes involving the reproductive organs are driven by the menstrual cycle—or by therapeutic (or pathologic) hormonal stimulation. We mark each scan with the date of the LMP. If the patient is on hormone therapy, we also mark the scan “HT.” We make these marks on the screen in a way that prevents their erasure every time the picture is frozen and unfrozen. This makes it possible for us to look at the scan days, weeks, or even years later and know what day of the cycle it represents. Every finding must be judged in light of the patient’s hormonal status.

Use a transvaginal transducer. It provides a high-resolution view of any pathology. If need be, it can be combined with a trans-abdominal transducer to afford a more deeply penetrating, panoramic view of the pelvis. We use a variety of transducers to achieve depth, color, power Doppler, and three- dimensional (3D) US.

Take a history and examine the patient. Before scanning your own patient, take a short history and perform a bimanual, palpatory pelvic exam. You may need to examine her again after the scan to verify a sonographic finding.

It is doubly important to take a history if you are scanning a referred patient. Omitting this element is no excuse for overlooking a disease or pathology.

A bimanual, palpatory pelvic exam may also be recommended for some referred patients.

A transvaginal scan is not always possible. There are a number of reasons why the transvaginal approach may not be advisable for some patients, including virginal status, atrophic postmenopausal vagina, agenesis of the vagina, and transverse vaginal septae. In such cases, the best alternative is a transrectal scan, which makes it possible to image the pelvic organs from almost exactly the same vantage point as transvaginal US.² With proper explanation (particularly with virginal patients), the initial reluctance and apprehension can usually be assuaged.

Don’t trust the referral slip. We recommend that you read, but do not overly trust, the referral slip. It often offers little useful information.

Helpful scanning techniques

Consider applying these maneuvers:

• place your non-scanning hand on the patient’s abdomen to help mobilize the pelvic contents as the transvaginal probe slides across the organs
• use the probe as an “eye” while your palpating finger touches the cervix, uterus, ovaries, and any adnexal mass. Observe the mobility of these structures in relation to each other and the pelvic wall. This technique yields what is often referred to as the “sliding organs” sign. It is possible to identify pelvic adhesions (if the structures do not slide freely) or rule them out (if they do)
• pinpoint the origin of any pain the patient may have by touching the ovary, cervix, and any adnexal mass. This technique is important in cases of ectopic pregnancy, adnexal torsion, or inflammatory disease of the pelvis or adnexae.

Start with a basic scan of key structures

On the way “in” toward the adnexae, take the time to look at the bladder and urethra (FIGURE 1). Some common pathologies of the bladder are diverticulae; calculi; and a thick and vascular bladder wall suggestive of cancer or endometrioma. Ask the patient whether she has experienced any hematuria if any of these pathologies are detected.

FIGURE 1 Imaging the bladder

(A, B) The bladder (bl), urethra (u), vagina (v), and rectum (r) appear in their proper relation in this sagittal view. The posterior angle of the bladder is also apparent (arrow closing an angle of about 110°). (C) Excessive thickness of the bladder wall suggests that this patient has cystitis. (D) Coronal view of the bladder and urethra (solid arrows).

Also take a look at the cervix, searching for Nabothian cysts, endocervical polyps, extreme vascularization (a possible indicator of cervical cancer), and prolapsing submucous myomas (FIGURE 2).

FIGURE 2 Uncommon pathology

A submucous myoma prolapses into the cervical canal in a 13-week intrauterine pregnancy. (A) Grayscale sagittal image and (B) outline view of the same image. (C,D) Color and power Doppler images show the blood supply to the myoma from the uterine cavity.

While you are looking, attempt to scan both kidneys and Morrison’s pouch. Large adnexal masses or fibroids of the uterus may put pressure on the ureter, causing various degrees of hydronephrosis.

Sometimes, when the right kidney is correctly imaged below the liver, you may detect fluid in the space between them (called Morrison’s space). This information has clear value that may aid in diagnosing the main pathology (i.e., ruptured tubal pregnancy, ascites, etc.).

Imaging of the ovaries

The best way to scan the ovaries is to use a high-frequency (4–9 MHz) transvaginal probe. In general, as the frequency of the probe increases, so does resolution of the image—but the ability to penetrate tissue diminishes. For this reason, for abdominal imaging, a 3-MHz probe is often used. For a transvaginal scan, in which the probe can be placed near an ovary, a 5-MHz probe is common. And for a scan of, say, the parathyroid gland, a 12-MHz probe is utilized.

During the reproductive years, the ovaries can be localized by their sonographic markers—the follicles (FIGURE 3A). The ovaries usually lie near the large hypogastric blood vessels (FIGURE 3B). During the secretory phase of the cycle, look for the corpus luteum, switching on the color or power Doppler mode to help locate it (FIGURES 3C, 3D).

The ovaries usually can be distinguished by their relative anechoic sono-texture in juxtaposition to the surrounding, constantly peristalsing small bowel. This strategy is the only help for spotting the ovaries in menopause, when they lose their follicles.

The size of the ovaries may be an important indicator of pathology. During the reproductive years, mean size is 8 mL (standard deviation [SD], 2–3 mL; range, 5–15 mL). Post-menopausal ovaries are small, with a mean size of 3.6 mL (SD, 1.4 mL; range, 1–14 mL).

FIGURE 3 How to spot the ovaries

(A) Anechoic follicles are markers of the ovary during the reproductive years. (B) The ovaries in relation to the hypogastric vessels. (C) Gray-scale image of the corpus luteum and the same image in (D) color Doppler.

A word about terminology: Don’t call follicles “cysts”

During a normal menstrual cycle, one or more follicles mature, reaching about 2 to 2.5 cm in diameter around mid-cycle. Do not call these follicles “cysts” or “follicular cysts.” They are follicles. Calling them cysts, or even including the word cyst in their description, suggests to many gynecology and radiology providers—and to patients themselves—the idea of pathology.¹

An exception to that rule: An ovary that is larger than 12 to 14 mL and has a hyperechoic hilus and more than 12 small (4–5 mm), peripherally pushed follicles is usually called “polycystic” (FIGURE 4).³ However, not every ovary that fulfills these sonographic criteria is indeed polycystic. At times normal ovaries may contain multiple follicles without any of the clinical or laboratory indications of a polycystic ovary. In these cases, the ovary may be of normal size and may lack a hyperechoic hilus with rich hilar vascularity. We term such ovaries “multicystic” in their appearance.

FIGURE 4 The polycystic ovary

(A) Gray-scale image of a polycystic ovary. The typical hyperechoic hilus is evident (H). (B) Gross pathologic section of a polycystic ovary. (C) 3D orthogonal planes of a large ovary with a multitude of small follicles pushed peripherally by a voluminous hyperechoic hilus. (D) 3D inversion rendering of the same ovary.

We employ 3D inversion rendering to better see and count the number of follicles (FIGURE 4D).

An ovary can have a polycystic appearance in the following clinical situations:

• hyperthyroid state (36% of affected women)
• hyperprolactinemia (50%)
• hypothalamic hypogonadism (24%).

It also can appear polycystic for no apparent reason.

Stay tuned!

Next month, we continue our focus on adnexal imaging by describing (and showing) nonneoplastic ovarian masses.

We want to hear from you! Tell us what you think.

No doubt about it: Scanning the adnexae is the most challenging task in gynecologic ultrasonography (US). There are many reasons for the difficulty, but probably none more important than the fact that you are expected to reach a conclusion about what you see—or at least narrow the differential diagnosis.

Some ultrasound laboratories try to hedge their bets, sending the referring physician a report that is nothing more than an exhaustive differential diagnosis, similar to what we see in textbooks. Such a list is useless to a referring clinician, who has probably already considered most of the possibilities and involved the lab to help narrow them down. Labs that send such reports are usually trying to protect themselves from litigation—typically involving cases in which ovarian cancer was missed—or attempting to accomplish a “self-referral” by encouraging further imaging.¹

The referring physician is not perfect, either. In our practice, we often receive reports like the following terse description:

A complex cyst was seen in the adnexa. Ovarian malignancy cannot be ruled out.

That’s it. No description of the actual sonographic characteristics. No Doppler velocity flow studies. Yet, the few remarks include a mention of malignancy, and the provider often suggests that “additional imaging such as CT and MRI should be considered.”

When we scrutinize the sonographic images upon which these reports are based, we often discover a corpus luteum, cystic teratoma, benign cystadenoma, endometrioma, or, even, a simple cyst.

The need for competency is compelling

Now that gynecologic US has matured as a field in its own right, the referring physician should expect much more from a laboratory’s pelvic scan than a long recitation of potential diagnoses. And the lab should expect more basic information from the referring provider.

That is the primary reason for this four-part series—to help you identify some of the most prevalent adnexal masses, so that you can exclude cases that are no cause for concern, such as a corpus luteum, and refer patients who really do need additional imaging and expertise, providing as much information in the process as you can.

In Part 1 of the series, we introduce you to basic concepts, recommend equipment, and step you through numerous fundamental scans. Part 2 will focus on nonneoplastic ovarian masses, Part 3 on ovarian neoplasms, and Part 4 on tubal entities such as ectopic pregnancy and torsion.

As much as possible, we educate you by providing actual scans that represent real cases, pointing out the elements that should grab your attention. After all, a picture paints a thousand words.

Ultrasound reveals the polycystic nature of a patient’s ovary. The hilus is prominently hyperechoic.

A few fundamental practices enhance consistency and thoroughness

Before we shift our focus to scanning techniques and interpretation of images, we’d like to offer several basic pointers.

Establish, and document, the hormonal milieu. One of the most important requirements of US imaging, particularly during the reproductive years, is determining and documenting the date of the patient’s last menstrual period (LMP). The reason? Physiologic and pathologic processes involving the reproductive organs are driven by the menstrual cycle—or by therapeutic (or pathologic) hormonal stimulation. We mark each scan with the date of the LMP. If the patient is on hormone therapy, we also mark the scan “HT.” We make these marks on the screen in a way that prevents their erasure every time the picture is frozen and unfrozen. This makes it possible for us to look at the scan days, weeks, or even years later and know what day of the cycle it represents. Every finding must be judged in light of the patient’s hormonal status.

Use a transvaginal transducer. It provides a high-resolution view of any pathology. If need be, it can be combined with a trans-abdominal transducer to afford a more deeply penetrating, panoramic view of the pelvis. We use a variety of transducers to achieve depth, color, power Doppler, and three- dimensional (3D) US.

Take a history and examine the patient. Before scanning your own patient, take a short history and perform a bimanual, palpatory pelvic exam. You may need to examine her again after the scan to verify a sonographic finding.

It is doubly important to take a history if you are scanning a referred patient. Omitting this element is no excuse for overlooking a disease or pathology.

A bimanual, palpatory pelvic exam may also be recommended for some referred patients.

A transvaginal scan is not always possible. There are a number of reasons why the transvaginal approach may not be advisable for some patients, including virginal status, atrophic postmenopausal vagina, agenesis of the vagina, and transverse vaginal septae. In such cases, the best alternative is a transrectal scan, which makes it possible to image the pelvic organs from almost exactly the same vantage point as transvaginal US.² With proper explanation (particularly with virginal patients), the initial reluctance and apprehension can usually be assuaged.

Don’t trust the referral slip. We recommend that you read, but do not overly trust, the referral slip. It often offers little useful information.

Helpful scanning techniques

Consider applying these maneuvers:

• place your non-scanning hand on the patient’s abdomen to help mobilize the pelvic contents as the transvaginal probe slides across the organs
• use the probe as an “eye” while your palpating finger touches the cervix, uterus, ovaries, and any adnexal mass. Observe the mobility of these structures in relation to each other and the pelvic wall. This technique yields what is often referred to as the “sliding organs” sign. It is possible to identify pelvic adhesions (if the structures do not slide freely) or rule them out (if they do)
• pinpoint the origin of any pain the patient may have by touching the ovary, cervix, and any adnexal mass. This technique is important in cases of ectopic pregnancy, adnexal torsion, or inflammatory disease of the pelvis or adnexae.

Start with a basic scan of key structures

On the way “in” toward the adnexae, take the time to look at the bladder and urethra (FIGURE 1). Some common pathologies of the bladder are diverticulae; calculi; and a thick and vascular bladder wall suggestive of cancer or endometrioma. Ask the patient whether she has experienced any hematuria if any of these pathologies are detected.

FIGURE 1 Imaging the bladder

(A, B) The bladder (bl), urethra (u), vagina (v), and rectum (r) appear in their proper relation in this sagittal view. The posterior angle of the bladder is also apparent (arrow closing an angle of about 110°). (C) Excessive thickness of the bladder wall suggests that this patient has cystitis. (D) Coronal view of the bladder and urethra (solid arrows).

Also take a look at the cervix, searching for Nabothian cysts, endocervical polyps, extreme vascularization (a possible indicator of cervical cancer), and prolapsing submucous myomas (FIGURE 2).

FIGURE 2 Uncommon pathology

A submucous myoma prolapses into the cervical canal in a 13-week intrauterine pregnancy. (A) Grayscale sagittal image and (B) outline view of the same image. (C,D) Color and power Doppler images show the blood supply to the myoma from the uterine cavity.

While you are looking, attempt to scan both kidneys and Morrison’s pouch. Large adnexal masses or fibroids of the uterus may put pressure on the ureter, causing various degrees of hydronephrosis.

Sometimes, when the right kidney is correctly imaged below the liver, you may detect fluid in the space between them (called Morrison’s space). This information has clear value that may aid in diagnosing the main pathology (i.e., ruptured tubal pregnancy, ascites, etc.).

Imaging of the ovaries

The best way to scan the ovaries is to use a high-frequency (4–9 MHz) transvaginal probe. In general, as the frequency of the probe increases, so does resolution of the image—but the ability to penetrate tissue diminishes. For this reason, for abdominal imaging, a 3-MHz probe is often used. For a transvaginal scan, in which the probe can be placed near an ovary, a 5-MHz probe is common. And for a scan of, say, the parathyroid gland, a 12-MHz probe is utilized.

During the reproductive years, the ovaries can be localized by their sonographic markers—the follicles (FIGURE 3A). The ovaries usually lie near the large hypogastric blood vessels (FIGURE 3B). During the secretory phase of the cycle, look for the corpus luteum, switching on the color or power Doppler mode to help locate it (FIGURES 3C, 3D).

The ovaries usually can be distinguished by their relative anechoic sono-texture in juxtaposition to the surrounding, constantly peristalsing small bowel. This strategy is the only help for spotting the ovaries in menopause, when they lose their follicles.

The size of the ovaries may be an important indicator of pathology. During the reproductive years, mean size is 8 mL (standard deviation [SD], 2–3 mL; range, 5–15 mL). Post-menopausal ovaries are small, with a mean size of 3.6 mL (SD, 1.4 mL; range, 1–14 mL).

FIGURE 3 How to spot the ovaries

(A) Anechoic follicles are markers of the ovary during the reproductive years. (B) The ovaries in relation to the hypogastric vessels. (C) Gray-scale image of the corpus luteum and the same image in (D) color Doppler.

A word about terminology: Don’t call follicles “cysts”

During a normal menstrual cycle, one or more follicles mature, reaching about 2 to 2.5 cm in diameter around mid-cycle. Do not call these follicles “cysts” or “follicular cysts.” They are follicles. Calling them cysts, or even including the word cyst in their description, suggests to many gynecology and radiology providers—and to patients themselves—the idea of pathology.¹

An exception to that rule: An ovary that is larger than 12 to 14 mL and has a hyperechoic hilus and more than 12 small (4–5 mm), peripherally pushed follicles is usually called “polycystic” (FIGURE 4).³ However, not every ovary that fulfills these sonographic criteria is indeed polycystic. At times normal ovaries may contain multiple follicles without any of the clinical or laboratory indications of a polycystic ovary. In these cases, the ovary may be of normal size and may lack a hyperechoic hilus with rich hilar vascularity. We term such ovaries “multicystic” in their appearance.

FIGURE 4 The polycystic ovary

(A) Gray-scale image of a polycystic ovary. The typical hyperechoic hilus is evident (H). (B) Gross pathologic section of a polycystic ovary. (C) 3D orthogonal planes of a large ovary with a multitude of small follicles pushed peripherally by a voluminous hyperechoic hilus. (D) 3D inversion rendering of the same ovary.

We employ 3D inversion rendering to better see and count the number of follicles (FIGURE 4D).

An ovary can have a polycystic appearance in the following clinical situations:

• hyperthyroid state (36% of affected women)
• hyperprolactinemia (50%)
• hypothalamic hypogonadism (24%).

It also can appear polycystic for no apparent reason.

Stay tuned!

Next month, we continue our focus on adnexal imaging by describing (and showing) nonneoplastic ovarian masses.

We want to hear from you! Tell us what you think.

No doubt about it: Scanning the adnexae is the most challenging task in gynecologic ultrasonography (US). There are many reasons for the difficulty, but probably none more important than the fact that you are expected to reach a conclusion about what you see—or at least narrow the differential diagnosis.

Some ultrasound laboratories try to hedge their bets, sending the referring physician a report that is nothing more than an exhaustive differential diagnosis, similar to what we see in textbooks. Such a list is useless to a referring clinician, who has probably already considered most of the possibilities and involved the lab to help narrow them down. Labs that send such reports are usually trying to protect themselves from litigation—typically involving cases in which ovarian cancer was missed—or attempting to accomplish a “self-referral” by encouraging further imaging.¹

The referring physician is not perfect, either. In our practice, we often receive reports like the following terse description:

A complex cyst was seen in the adnexa. Ovarian malignancy cannot be ruled out.

That’s it. No description of the actual sonographic characteristics. No Doppler velocity flow studies. Yet, the few remarks include a mention of malignancy, and the provider often suggests that “additional imaging such as CT and MRI should be considered.”

When we scrutinize the sonographic images upon which these reports are based, we often discover a corpus luteum, cystic teratoma, benign cystadenoma, endometrioma, or, even, a simple cyst.

The need for competency is compelling

Now that gynecologic US has matured as a field in its own right, the referring physician should expect much more from a laboratory’s pelvic scan than a long recitation of potential diagnoses. And the lab should expect more basic information from the referring provider.

That is the primary reason for this four-part series—to help you identify some of the most prevalent adnexal masses, so that you can exclude cases that are no cause for concern, such as a corpus luteum, and refer patients who really do need additional imaging and expertise, providing as much information in the process as you can.

In Part 1 of the series, we introduce you to basic concepts, recommend equipment, and step you through numerous fundamental scans. Part 2 will focus on nonneoplastic ovarian masses, Part 3 on ovarian neoplasms, and Part 4 on tubal entities such as ectopic pregnancy and torsion.

As much as possible, we educate you by providing actual scans that represent real cases, pointing out the elements that should grab your attention. After all, a picture paints a thousand words.

Ultrasound reveals the polycystic nature of a patient’s ovary. The hilus is prominently hyperechoic.

A few fundamental practices enhance consistency and thoroughness

Before we shift our focus to scanning techniques and interpretation of images, we’d like to offer several basic pointers.

Establish, and document, the hormonal milieu. One of the most important requirements of US imaging, particularly during the reproductive years, is determining and documenting the date of the patient’s last menstrual period (LMP). The reason? Physiologic and pathologic processes involving the reproductive organs are driven by the menstrual cycle—or by therapeutic (or pathologic) hormonal stimulation. We mark each scan with the date of the LMP. If the patient is on hormone therapy, we also mark the scan “HT.” We make these marks on the screen in a way that prevents their erasure every time the picture is frozen and unfrozen. This makes it possible for us to look at the scan days, weeks, or even years later and know what day of the cycle it represents. Every finding must be judged in light of the patient’s hormonal status.

Use a transvaginal transducer. It provides a high-resolution view of any pathology. If need be, it can be combined with a trans-abdominal transducer to afford a more deeply penetrating, panoramic view of the pelvis. We use a variety of transducers to achieve depth, color, power Doppler, and three- dimensional (3D) US.

Take a history and examine the patient. Before scanning your own patient, take a short history and perform a bimanual, palpatory pelvic exam. You may need to examine her again after the scan to verify a sonographic finding.

It is doubly important to take a history if you are scanning a referred patient. Omitting this element is no excuse for overlooking a disease or pathology.

A bimanual, palpatory pelvic exam may also be recommended for some referred patients.

A transvaginal scan is not always possible. There are a number of reasons why the transvaginal approach may not be advisable for some patients, including virginal status, atrophic postmenopausal vagina, agenesis of the vagina, and transverse vaginal septae. In such cases, the best alternative is a transrectal scan, which makes it possible to image the pelvic organs from almost exactly the same vantage point as transvaginal US.² With proper explanation (particularly with virginal patients), the initial reluctance and apprehension can usually be assuaged.

Don’t trust the referral slip. We recommend that you read, but do not overly trust, the referral slip. It often offers little useful information.

Helpful scanning techniques

Consider applying these maneuvers:

• place your non-scanning hand on the patient’s abdomen to help mobilize the pelvic contents as the transvaginal probe slides across the organs
• use the probe as an “eye” while your palpating finger touches the cervix, uterus, ovaries, and any adnexal mass. Observe the mobility of these structures in relation to each other and the pelvic wall. This technique yields what is often referred to as the “sliding organs” sign. It is possible to identify pelvic adhesions (if the structures do not slide freely) or rule them out (if they do)
• pinpoint the origin of any pain the patient may have by touching the ovary, cervix, and any adnexal mass. This technique is important in cases of ectopic pregnancy, adnexal torsion, or inflammatory disease of the pelvis or adnexae.

Start with a basic scan of key structures

On the way “in” toward the adnexae, take the time to look at the bladder and urethra (FIGURE 1). Some common pathologies of the bladder are diverticulae; calculi; and a thick and vascular bladder wall suggestive of cancer or endometrioma. Ask the patient whether she has experienced any hematuria if any of these pathologies are detected.

FIGURE 1 Imaging the bladder

(A, B) The bladder (bl), urethra (u), vagina (v), and rectum (r) appear in their proper relation in this sagittal view. The posterior angle of the bladder is also apparent (arrow closing an angle of about 110°). (C) Excessive thickness of the bladder wall suggests that this patient has cystitis. (D) Coronal view of the bladder and urethra (solid arrows).

Also take a look at the cervix, searching for Nabothian cysts, endocervical polyps, extreme vascularization (a possible indicator of cervical cancer), and prolapsing submucous myomas (FIGURE 2).

FIGURE 2 Uncommon pathology

A submucous myoma prolapses into the cervical canal in a 13-week intrauterine pregnancy. (A) Grayscale sagittal image and (B) outline view of the same image. (C,D) Color and power Doppler images show the blood supply to the myoma from the uterine cavity.

While you are looking, attempt to scan both kidneys and Morrison’s pouch. Large adnexal masses or fibroids of the uterus may put pressure on the ureter, causing various degrees of hydronephrosis.

Sometimes, when the right kidney is correctly imaged below the liver, you may detect fluid in the space between them (called Morrison’s space). This information has clear value that may aid in diagnosing the main pathology (i.e., ruptured tubal pregnancy, ascites, etc.).

Imaging of the ovaries

The best way to scan the ovaries is to use a high-frequency (4–9 MHz) transvaginal probe. In general, as the frequency of the probe increases, so does resolution of the image—but the ability to penetrate tissue diminishes. For this reason, for abdominal imaging, a 3-MHz probe is often used. For a transvaginal scan, in which the probe can be placed near an ovary, a 5-MHz probe is common. And for a scan of, say, the parathyroid gland, a 12-MHz probe is utilized.

During the reproductive years, the ovaries can be localized by their sonographic markers—the follicles (FIGURE 3A). The ovaries usually lie near the large hypogastric blood vessels (FIGURE 3B). During the secretory phase of the cycle, look for the corpus luteum, switching on the color or power Doppler mode to help locate it (FIGURES 3C, 3D).

The ovaries usually can be distinguished by their relative anechoic sono-texture in juxtaposition to the surrounding, constantly peristalsing small bowel. This strategy is the only help for spotting the ovaries in menopause, when they lose their follicles.

The size of the ovaries may be an important indicator of pathology. During the reproductive years, mean size is 8 mL (standard deviation [SD], 2–3 mL; range, 5–15 mL). Post-menopausal ovaries are small, with a mean size of 3.6 mL (SD, 1.4 mL; range, 1–14 mL).

FIGURE 3 How to spot the ovaries

(A) Anechoic follicles are markers of the ovary during the reproductive years. (B) The ovaries in relation to the hypogastric vessels. (C) Gray-scale image of the corpus luteum and the same image in (D) color Doppler.

A word about terminology: Don’t call follicles “cysts”

During a normal menstrual cycle, one or more follicles mature, reaching about 2 to 2.5 cm in diameter around mid-cycle. Do not call these follicles “cysts” or “follicular cysts.” They are follicles. Calling them cysts, or even including the word cyst in their description, suggests to many gynecology and radiology providers—and to patients themselves—the idea of pathology.¹

An exception to that rule: An ovary that is larger than 12 to 14 mL and has a hyperechoic hilus and more than 12 small (4–5 mm), peripherally pushed follicles is usually called “polycystic” (FIGURE 4).³ However, not every ovary that fulfills these sonographic criteria is indeed polycystic. At times normal ovaries may contain multiple follicles without any of the clinical or laboratory indications of a polycystic ovary. In these cases, the ovary may be of normal size and may lack a hyperechoic hilus with rich hilar vascularity. We term such ovaries “multicystic” in their appearance.

FIGURE 4 The polycystic ovary

(A) Gray-scale image of a polycystic ovary. The typical hyperechoic hilus is evident (H). (B) Gross pathologic section of a polycystic ovary. (C) 3D orthogonal planes of a large ovary with a multitude of small follicles pushed peripherally by a voluminous hyperechoic hilus. (D) 3D inversion rendering of the same ovary.

We employ 3D inversion rendering to better see and count the number of follicles (FIGURE 4D).

An ovary can have a polycystic appearance in the following clinical situations:

• hyperthyroid state (36% of affected women)
• hyperprolactinemia (50%)
• hypothalamic hypogonadism (24%).

It also can appear polycystic for no apparent reason.

Stay tuned!

Next month, we continue our focus on adnexal imaging by describing (and showing) nonneoplastic ovarian masses.

We want to hear from you! Tell us what you think.