Excerpt from Angiokeratoma of the Scrotum

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Background

In 1896, John Addison Fordyce first described angiokeratomas of Fordyce on the scrotum of a 60-year-old man. Angiokeratomas are typically asymptomatic, 2- to 5-mm, blue-to-red papules with a scaly surface located on the scrotum, shaft of penis, labia majora, inner thigh, or lower abdomen. Histologically, they are composed of ectatic thin-walled vessels in the superficial dermis with overlying epidermal hyperplasia.

Precise data on their frequency and distribution are lacking, although estimations have been made. The principle morbidity comes from bleeding, anxiety, and overtreatment due to misdiagnosis by physicians. Usually, they do not require treatment. If treatment is needed, then locally destructive methods including laser, electrocoagulation, excision, cryotherapy, or laser therapy  may be used.

Pathophysiology

The pathophysiology of angiokeratomas remains unknown, although it has been proposed that an increased venous pressure may contribute to their formation.¹

Many reports describe angiokeratomas occurring in the presence of a varicocele or other conditions of increased venous pressure (eg, hernias, epididymal tumors, urinary system tumors). One series reports that up to two thirds of patients have associated conditions. One case exists where the varicocele was treated and the angiokeratomas resolved,² and one report exists in which varicocele treatment failed to produce improvement.

Equally, there are many cases where no cause for increased venous pressure was found. In a study of 435 military recruits aged 18-19 years, 10% (n = 46) were found to have varicoceles; none had angiokeratomas. They also surveyed 30 soldiers aged 45-55 years with varicoceles but found no angiokeratomas. They propose that the coexistence of varicocele and angiokeratomas are coincidental.³ Similarly, a study of 1552 Japanese males found no history of any venous obstructive disorders.

In a study of vulval angiokeratomas 54% of patients were noted to have a predisposing factor (eg, pregnancy, vulval varicosity, post partum, post hysterectomy), while the rest had none.

Penile and vulvar angiokeratomas have also been noted status post radiation treatment of genitourinary malignancy.⁴

Angiokeratomas of Fordyce have also been reported in association with nevus lipomatosus,⁵ oral mucosal angiokeratomas,⁶ and papular xanthoma.⁷

Frequency

International

The precise incidence of angiokeratomas of Fordyce is unknown, but they are considered common especially with increasing age.

Mortality/Morbidity

No fatalities have been reported from this condition. The most significant morbidity comes from bleeding. The papules can bleed spontaneously if traumatized or during intercourse. Many of the cases report patients concern that the lesions represent a sexually transmitted disease.

Race

Large series of angiokeratomas have been reported from America and Japan, which give a picture of disease predominantly in whites and in Japanese populations. Cases in blacks exist but are few in number. The only publications on vulval lesions have been in white women.

Sex

Males have been reported far more often than females, although direct figures of comparison do not exist. It has been commented that female angiokeratomas are probably as common as males but grossly underreported and underrepresented in the literature.

Age

Cases have been reported ranging from children born with lesions to lesions developing in patients in their sixth decade. The only publication on vulval lesions, identified by pathology reports of removed lesions, showed that 68% of lesions occurred in women aged 20-40 years. A study of 1552 Japanese males found that the condition occurred at all ages but was most prevalent among people older than 40 years. Prevalence was as follows:

• Age 16-20 years - 0.6%
• Age 21-30 years - 1.5%
• Age 31-40 years - 6.2%
• Age 41-50 years - 13.1%
• Age 51-60 years - 13.4%
• Age 61-70 years - 15.9%
• Age 70 years or older - 16.6%

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