Angiokeratoma Circumscriptum Clinical Presentation
- Author: William P Baugh, MD; Chief Editor: William D James, MD more...
History
- Angiokeratoma circumscriptum lesions are most commonly found on the lower extremities as an asymptomatic solitary papule or plaque, but they can also be found in the upper extremities and the trunk.[10] One incidence of angiokeratoma circumscriptum involved an asymmetrical distribution in a systematized bandlike, segmental arrangement in the trunk, legs, and face.[11]
- Several reports have noted angiokeratoma circumscriptum appearing on the ventral and, less commonly, the dorsal surface of the tongue.[12, 13]
- Occasionally, multiple lesions develop, usually after adolescence.
- Patients may present with a rapid darkening or a change of the lesion.
- Sometimes, patients may be specifically concerned about the possibility of melanoma, given the color of the lesion.[14] See the images below.
A hyperkeratotic, asymmetric, variably pigmented, black 3 X 4-mm papule was found on the upper right medial part of the arm of this 18-year-old woman, who was concerned about melanoma. The histologic analysis revealed a thrombosed angiokeratoma circumscriptum.
Close-up view of an asymmetric black angiokeratoma mimicking a melanoma.
Physical
- The primary lesions of angiokeratoma consist of elevated, warty, dark red to purple, slightly compressible papules.
- Small nodules or plaques can also be seen.
- Sometimes, a linear distribution (with bands or streaks) of papules develops.
- A rough hyperkeratotic scale is often found over the surface and the edges of these papules due to epithelial hyperplasia and hyperkeratosis.
- The lesions often have irregular borders and associated pigmentation, which is mostly attributable to intraepidermal hemorrhage or associated hemosiderin pigment deposition in the dermis.
- If excoriated or traumatized, angiokeratomas may present with epithelial erosion and bleeding.
Causes
The cause of angiokeratoma circumscriptum is unknown. Several causal factors, such as congenital development, pregnancy, trauma,[15] subcutaneous hematomas, and tissue asphyxia, have all been proposed (see Pathophysiology).
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