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Melanoma masquerading as xanthogranuloma: a diagnostic pitfall
Munir H Idriss1, Graciela De Jesús, Steve A McClain
1Ackerman Academy of Dermatopathology, New York, NY 10016, USA. mhidriss@gmail.com
The American Journal of Dermatopathology
|November 30, 2012
Summary
This study highlights a rare melanoma case mimicking xanthogranuloma. Immunohistochemistry is crucial for distinguishing melanoma from histiocytic tumors.
Area of Science:
- Dermatopathology
- Oncology
- Histopathology
Background:
- Melanoma exhibits diverse histologic features, sometimes mimicking nonmelanocytic tumors.
- Differentiating melanoma from histiocytic proliferations can be challenging.
- Xanthogranuloma is a benign proliferation of histiocytes.
Observation:
- An unusual melanoma case presented with clinical and histopathological features resembling xanthogranuloma.
- Histology showed pleomorphic cells with foamy cytoplasm and giant cells, alongside inflammatory cells.
- Pagetoid scatter of atypical cells was noted in the epidermis.
Findings:
- Immunohistochemical staining confirmed melanoma.
- CD163 staining was patchy, indicating an inflammatory component.
- Melan A and tyrosinase staining were positive in atypical cells, confirming malignant melanoma.
Implications:
- This case broadens the understanding of melanoma's varied presentations.
- Judicious use of immunohistochemistry is vital for accurate diagnosis.
- Distinguishing melanoma from histiocytic tumors requires careful histopathological evaluation and specific markers.
