DDx
Diagnostic Considerations
Also consider the following:
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Acquired agminated acral angioma [20]
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Capillary aneurysm
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Lymphangioma circumscriptum
Differential Diagnoses
Media Gallery
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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.
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Close-up view of an asymmetric black angiokeratoma mimicking a melanoma.
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Low-magnification histologic view reveals some hyperkeratosis and acanthosis with rete ridges surrounding dilated vascular channels in the papillary dermis.
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This mid-power histologic view reveals dilated vessels in the papillary and upper reticular dermis. The vessels are packed with red blood cells; this finding is suggestive of vessel thrombosis.
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This high-power histologic view reveals some hyperkeratosis and acanthosis with rete ridges surrounding dilated vascular channels in the papillary dermis. Dilated vessels in the papillary and upper reticular dermis are observed. The vessels are packed with red blood cells; this finding is suggestive of vessel thrombosis. A normal-appearing vascular endothelium is found. No evidence of a melanocytic lesion is present.
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