[A case of enucleation for multiple renal cell carcinomas in unilateral kidney with microwave tissue coagulator]

A 67-year-old man, who had undergone left nephroureterectomy for ureteral tumor (transitional cell carcinoma, G1) eight years previously, was found to have two renal tumors in the residual right kidney by the follow-up computed tomography (CT). We performed non-ischemic enucleation for multiple tumors at the upper and lower pole in the unilateral kidney using a microwave tissue coagulator (MTC). We confirmed by means of ultrasonography during operation the absence of any other satellite tumors. The operation time was 154 minutes and bleeding during operation was 267 ml. There was no difference between creatinine before (0.73 mg/dl) and after (0.79 mg/dl) operation. On the follow-up CT, there was a low density area after enucleation. This area gradually decreased and disappeared on enhanced CT 18 months after operation. We enucleated multiple renal cell carcinomas using MTC without reduction of renal function or remarkable side effects. These results suggested that non-ischemic enucleation using MTC would be useful for multiple renal cell carcinoma in the unilateral kidney.