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Angiomatoid metastatic melanoma
Bettina G Zelger1, Bernhard Zelger
1Department of Pathology Dermatology, University of Innsbruck, Innsbruck, Austria. bettina.zelger@uibk.ac.at
Summary
Two metastatic melanoma patients presented with unusual tumor morphology and a benign clinical course. Despite extensive necrosis in metastases, residual melanoma cells were identified, leading to successful treatment and long-term remission.
Area of Science:
- Oncology
- Dermatopathology
- Immunology
Background:
- Metastatic melanoma presents a significant clinical challenge.
- Understanding rare morphologic variants is crucial for accurate diagnosis and treatment.
- Investigating unusual presentations can reveal novel insights into tumor behavior.
Observation:
- Two patients with metastatic melanoma exhibited unique histological features in their metastases.
- Metastatic lesions showed extensive central necrosis and hemorrhage with a granulomatous reaction.
- The morphology mimicked angiomatoid malignant fibrous histiocytoma, obscuring the melanoma origin.
Findings:
- Despite extensive immunohistochemistry and ultrastructural analysis, melanoma tissue was not initially apparent.
- Careful macroscopic examination revealed small foci of residual melanoma within the granulation tissue.
- Both patients, despite initial diagnostic challenges, experienced a comparatively benign clinical course.
Implications:
- This case highlights the importance of thorough macroscopic examination in diagnosing challenging metastatic lesions.
- The findings suggest that some metastatic melanomas may undergo significant regression or morphologic transformation.
- Successful management with surgery, immunochemotherapy, and autologous vaccination in these cases offers hope for similar rare presentations.