Hemangioendothelioma of urinary bladder--report of rare case.

Although cavernous hemangiomas and a few cases of angiosarcoma in the urinary bladder have been described, only a single case of epithelioid hemangioendothelioma of the urinary bladder has been documented in English publications, to date. Therefore, the biologic properties of epithelioid hemangioendothelioma in this location are uncertain. We report the clinical and pathologic findings of a case of primary epithelioid hemangioendothelioma of the urinary bladder in a 17-years-old boy. The tumor was treated by transurethral resection.