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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.
Abstract:
We describe a patient who developed a pigmented plaque on the anterior aspect of his right knee clinically mimicking angiokeratoma circumscriptum or malignant melanoma. Histopathological examination demonstrated a multinodular hemosiderotic dermatofibroma in which the cellular tumor islands were separated by areas of hyalinized collagen. Multinucleated giant tumor cells were found in the lumen of a medium-size vein underlying the tumor. The differential diagnosis of angiomatoid malignant fibrous histiocytoma, a tumor with clinical and morphologic similarities, is discussed.
Insights
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.
- Understanding the distinct features of hemosiderotic dermatofibroma aids in its differentiation from other pigmented skin lesions and tumors.