[Two Cases of Unilateral Multifocal Renal Cell Carcinoma Treated with Robot-Assisted Partial Nephrectomy]

Recently, robot-assisted laparoscopic partial nephrectomy (RAPN) has become a commonly performed surgical treatment for small renal tumors, but for difficult cases, such as those presenting with multiple tumors, there are few institutions with experience. We herein report two cases of unilateral multifocal renal cell carcinoma that were successfully treated with RAPN. Case 1: A 65-year-oldwoman was incidentally identified to have two right kidney tumors on imaging. RAPN under cold ischemia was performed. Pathological examinations revealed both tumors to be clear cell carcinoma. Case 2: A 56-year-oldman was incidentally found to have two left kidney tumors on imaging. RAPN under zero-ischemia and warm ischemia was performed. Pathological examinations revealed both tumors to be clear cell carcinoma. In both cases, no recurrence has been observed, and the decrease that occurred in the renal function was mild during the one-and-a half year follow-up.