Carcinosarcoma of the renal pelvis: a case report with immunohistochemical study.

The clinicopathologic feature of one carcinosarcoma of the renal pelvis is reported. The tumor occurred in a 51-year-old woman with a long standing history of renal calculi. The epithelial component was consistent with squamous cell carcinoma, whereas the sarcomatous component was composed of pleomorphic spindle cells. The immunohistochemical studies demonstrated obvious epithelial and mesenchymal reactivity respectively. The tumor progressed rapidly with widespread metastases and the patient died one month after operation.