Sarcomas of the bladder and prostate: the role of immunohistochemistry and ultrastructure in diagnosis.

2 undifferentiated malignant tumors of the bladder/prostate region (one with urinary schistosomiasis) and 6 carcinomas with spindle cell morphology were studied by immunohistochemical markers and electron microscopy. Our findings indicate that the categorization of undifferentiated tumors of this region is significantly aided by the use of such methods.