Parenchymal operations of the lower pole of the kidney with a double collecting system

The authors present four cases of unilateral kidney with a double collecting system where calculous change has occurred in the lower collecting system. In one of them, marginopolar nephrotomy, while in three, heminephrectomies in the destructed lower segment of the kidney were performed. The remaining upper part functioned perfectly later on. The avoidance of unjustified nephrectomy is stressed.