title: Clear cell sarcoma: report of two cases with ultrastructural observations and review of the literature.
abstract: Two cases of clear cell sarcoma of tendons and aponeuroses, one with prominent melanogenesis, are reported. One tumour arose in the left buttock of a young male and the other in the left fourth toe of a young female. Both had a rapid fatal course with local and distant metastases. Electron microscopy shows melanosomes in one case, suggesting a melanotic origin.
mesh_terms: D000293:Adolescent; D000328:Adult; D002081:Buttocks; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008543:Melanins / Q000032:analysis; D008544:Melanocytes / Q000473:pathology; D008545:Melanoma / Q000473:pathology; D008854:Microscopy, Electron; D009362:Neoplasm Metastasis; D012509:Sarcoma / Q000401:mortality / Q000473:pathology* / Q000648:ultrastructure; D013710:Tendons / Q000473:pathology*; D014034:Toes
chemical_list: D008543:Melanins