[Conservative surgery for synchronous bilateral renal cell carcinoma: report of two cases].

We present two cases of synchronous bilateral renal cell carcinoma treated at Daisan Hospital. Case 1. A 63-year-old man was hospitalized in August 1988 because of right flank pain and fever. Diagnostic imaging showed a large tumor on the right kidney extending into the inferior vena cava, and a smaller one (3.0 cm diameter) on the left middle part. The patient underwent right radical nephrectomy with vena cana resection, and left tumor enucleation at the same time. Histology demonstrated renal cell carcinoma on both sides. The patient is alive without recurrence and with normal renal function 5 years and 1 month after the operation. Case 2. A 62-year-old man was hospitalized in August 1992 because of a feeling of abdominal distension. Diagnostic imaging showed a 3.5 cm diameter tumor on the right kidney, a 6.0 cm diameter tumor on the left kidney. The patient underwent bilateral partial nephrectomy at the same time. Histology demonstrated renal cell carcinoma on both sides. The patient is well without recurrence at 10 months after the operation. Conservative surgery proved effective therapy for patients with bilateral renal cell carcinoma.