Schulman C C
J Pediatr Surg. 1978 Oct;13(6):537. doi: 10.1016/s0022-3468(78)80325-x.
Obstruction of the ureteropelvic junction from a polypoid lesion is considered to be an exceedingly rare cause of hydronephrosis in childhood.
输尿管肾盂连接处因息肉样病变而梗阻被认为是儿童肾积水极为罕见的原因。