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Multinodular hemosiderotic dermatofibroma.

L Requena¹, A Aguilar, M J López Redondo

¹Departamento de Dermatología, Hospital Universitario San Carlos, Facultad de Medicina, Universidad Complutense, Madrid, España.

|January 1, 1990

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A rare skin condition, multinodular hemosiderotic dermatofibroma, presented as a pigmented plaque on the knee. Histopathology revealed key features, distinguishing it from similar conditions like melanoma.

Area of Science:

Dermatopathology
Oncology

Background:

Pigmented skin lesions require accurate diagnosis to differentiate benign conditions from malignancies.
Dermatofibromas are common skin tumors, but specific variants can present diagnostic challenges.

Observation:

A patient presented with a pigmented plaque on the knee, clinically suspicious for angiokeratoma circumscriptum or malignant melanoma.
Histopathological examination was crucial for definitive diagnosis.

Findings:

The lesion was identified as a multinodular hemosiderotic dermatofibroma.
Microscopic findings included cellular tumor islands separated by hyalinized collagen and multinucleated giant tumor cells within a vein.

Implications:

This case highlights the importance of histopathology in diagnosing unusual dermatofibroma presentations.

Related Experiment Videos

Understanding the distinct features of hemosiderotic dermatofibroma aids in its differentiation from other pigmented skin lesions and tumors.