Simultaneous occurrence of renal cell adenocarcinoma and urothelial carcinoma of the renal pelvis in the same kidney diagnosed by preoperative angiography.

An unusual case of dissimilar histologic neoplasms in the same kidney is presented. An 86-year-old man had renal cell carcinoma and urothelial carcinoma in the same kidney eight years after therapy for urinary bladder carcinoma. These two different types of neoplasms were identified preoperatively by angiography. A peculiar hamartoma was also found in the same kidney.