[A case of renal leiomyosarcoma].

A case of renal leiomyosarcoma is presented. A 65-year-old man was admitted with asymptomatic gross hematuria. On excretory pyelography, the left kidney was not visualized. Computed tomography showed a left intrarenal mass. The patient underwent left radical nephrectomy. The histological diagnosis was leiomyosarcoma probably originating from the left renal pelvis.