Dermatofibroma - DermAtlas - Dermatology Image Atlas

Contributor

Greg Hosler, MD, PhD

Diagnosis

dermatofibroma

Body Site

forearm

Age

49 years

Pigmentation

light

Organization

discrete

Color

red brown

Morphology

papule

Pattern

solitary

Comments

This is an unusual variant of dermatofibroma, a benign fibrohistiocytic tumor. One can call it a hemosiderotic dermatofibroma or an aneurysmal dermatofibroma, depending on the relative contribution of the vascular component. The presence of pigment may scare the untrained eye, but this pigment is hemosiderin. The differential diagnosis would include a melanocytic or vascular lesion. One must look to the periphery of the lesion to find the more traditional patten of a dermatofibroma.

Description

The edge of the lesion shows more traditional collagen trapping by short spindled cells. Multinucleated giant cells with abundant pigment are scattered throughout the lesion.

Image Added

8/28/2006 22:09:27

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Other Resources

PubMed Medline Plus Medscape

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