Based on their personal observations, the authors discuss the nephrectomy procedure with a preoperative intraluminal occlusion of the renal artery in tumor involved kidneys. Surgical intervention, performed according to the suggested principles, in 84% of cases perfectly provides for the primary arrest of arterial blood supply and ischemic reduction of the tumor and kidney in size, prevents dissemination of tumor cells or emboli, lessens the operative blood loss, shortens the time of surgery and the postoperative period, and facilitates the operative procedure even in emaciated aged and senile patients.