[Two cases of synchronous bilateral renal tumors].

Case 1: A 56-year-old man visited us complaining of gross hematuria. Because of his refusal to undergo a surgical operation, we performed embolization and chemotherapy, which were ineffective and he died of cancerous cachexia. Case 2: A 59-year-old female with microscopic hematuria was referred to our clinic. Left partial nephrectomy and right radical nephrectomy were done in a two-stage operation at a 3 month interval. She is now well without sign of recurrence at 9 months after the last operation.