Bilateral renal cell carcinoma.

Bilateral renal cell carcinoma was diagnosed simultaneously in 6 patients and sequentially in 4 patients, 3 to 14 years after the first tumor had been removed by nephrectomy. Four patients treated conservatively with incomplete excision of the malignant disease are alive 18 months to 14 years after diagnosis. Oue experience suggests that a radical excision, requiring renal dialysis or transplantation, is seldom warranted.