title: Soft-tissue sarcoma of undetermined histogenesis: an ultrastructural study.
abstract: A certain proportion of soft-tissue sarcomas are difficult to classify accurately. In this case report, initial light microscope observations of a soft-tissue tumor suggested a diagnosis of a monophasic synovial sarcoma. However, critical evaluation of the histologic features, results of studies with special stains, and ultrastructural observations indicated that this tumor is best categorized as an undifferentiated soft-tissue sarcoma of "undetermined histogenesis."
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D012509:Sarcoma / Q000145:classification / Q000175:diagnosis / Q000648:ultrastructure*; D013584:Sarcoma, Synovial / Q000145:classification / Q000175:diagnosis; D012983:Soft Tissue Neoplasms / Q000145:classification / Q000175:diagnosis / Q000648:ultrastructure*