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Osteogenic melanoma
1Department of Pathology, The Jikei University School of Medicine, Tokyo, Japan. maasafu@jikei.ac.jp
Summary
This case study describes osteogenic melanoma, a rare cancer forming bone and cartilage, in a patient with a history of malignant melanoma. Early recognition and differentiation from similar conditions are crucial for effective treatment.
Area of Science:
- Oncology
- Dermatopathology
- Skeletal Biology
Background:
- Osteogenic melanoma is an exceptionally rare variant of malignant melanoma.
- It is characterized by the neoplastic production of osteoid and/or cartilage.
- This case highlights a recurrence in a patient with a history of cutaneous malignant melanoma.
Observation:
- A 75-year-old male presented with a recurrent tumor on the sole of his left foot.
- The tumor was an unencapsulated, poorly circumscribed mass involving the dermis, subcutis, and muscle.
- Histopathological examination revealed malignant osteocartilaginous elements and epithelioid cells.
Findings:
- Immunohistochemical analysis showed strong positivity for HMB45 and S-100 protein.
- No conventional melanoma components were identified in the skin.
- The tumor demonstrated features of osteogenic differentiation within a melanoma.
Implications:
- Pathologists and clinicians must be aware of osteogenic melanoma to ensure accurate diagnosis.
- Differentiating this rare entity from other bone-forming or melanocytic tumors is critical.
- Prompt recognition and surgical management may lead to favorable outcomes, as seen in this patient who showed no recurrence at 10 months post-surgery.