Abstract

A Clear Cell Sarcoma (C. C. S.) producing melanin pigments similar to malignant melanoma (M. M.) was first described by Enzinger in 1965, even though C. C. S. is deeply located, arising from structures such as tendons. We report on a 21 year-old male referred to us with a right swollen heel revealing radiographic osteolytic destruction in the calcaneus. Histologically the tumor was characterized by pale-staining tumor cells arranged in nests. Hemosideroid granules were identified as melanin by Fontana-Masson staining and positive HMB-45. Vimentin, S-100 and N. S. E. were positive, while keratin, E. M. A. were negative. A syme amputation was performed, preserving the anterior planter flap to cover the heel followed by a 5cm lengthening of the tibia. Metastases to the popliteal lymph node was found two months post operatively, and the patient died with diffuse lymph node and lung metastases. Prognosis of this C. C. S. case was poor even after chemo-immuno therapy.

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