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Malignant melanoma showing smooth muscle differentiation
S S Banerjee1, P W Bishop, C M Nicholson
1Department of Pathology, Christie Hospital, Manchester.
Journal of Clinical Pathology
|November 1, 1996
Summary
This case study details a rare metastatic sarcomatoid melanoma with smooth muscle differentiation in an axillary lymph node. The tumor cells showed smooth muscle markers but lacked typical melanoma markers.
Area of Science:
- Oncology
- Pathology
- Dermatology
Background:
- Metastatic malignant melanoma can present with diverse histological patterns.
- Sarcomatoid melanoma is a rare subtype characterized by spindle cell morphology.
- Lymph node metastasis is a critical prognostic factor in melanoma.
Observation:
- A unique case of metastatic non-desmoplastic sarcomatoid malignant melanoma was identified in an axillary lymph node.
- The patient was a 54-year-old woman.
- The tumor exhibited smooth muscle differentiation.
Findings:
- Tumor cells were positive for alpha-smooth muscle actin, HHF-35, and desmin.
- Tumor cells were negative for S100 protein and HMB-45, which are common melanoma markers.
- Ultrastructural examination confirmed a smooth muscle phenotype, distinguishing it from myofibroblastic differentiation seen in desmoplastic melanomas.
Implications:
- This case expands the differential diagnosis of metastatic melanoma with spindle cell morphology.
- Understanding smooth muscle differentiation in melanoma is crucial for accurate diagnosis and treatment.
- Further research may elucidate the origins and behavior of melanomas with divergent differentiation.