A Case of Malignant Melanoma of Soft Parts of the Meck

We recently experienced a case of malignant melanoma of the soft tissue, which is a rare disease. The patient was a 29-year-old woman who complained of a mass on the right supraclavicular fossa. Wide resection was performed with dissection of neck lymph nodes as the tumor was suspected to be a clear cell sarcoma of tendons and aponeuroses by incisional biopsy. A tumor embolism was noted in the right subclavian vein. In the surgical specimen, melanin pigment was light-microscopically noted and melanosomes were detected electron-microscopically in the tumor cells. The tumor was diagnosed as soft-tissue malignant melanoma, termed clear cell sarcoma of tendons and aponeuroses by Enzinger et al. The patient underwent DVA adjuvant chemotherapy and is currently alive without any recurrent sign after the operation.