Duplex renal collecting system with upper pole obstructed ectopic ureter

Intraoperative image of duplex renal collecting system with upper pole-obstructed ectopic ureter (black arrows). The dilated upper pole ureter is approximately 6 times the normal size compared with normal lower pole ureter (white arrowheads). Note the course of the ectopic ureter is underneath the normal lower pole ureter. It is headed to an ectopic location past the bladder, which is mostly covered by the metal retractor blade.