Imaging of ureteral duplication with a non-functioning component.

31 patients of ureteral duplication were selected when one moiety of the duplex system was poorly visualised with either IVU or DTPA studies. Both ultrasound and IVU were performed in all cases. DTPA scans were performed in 17 cases and MCUs in 26 cases. The cases were divided into 2 groups. Group 1 (28 patients), with hydronephrosis and hydroureter, was further subdivided into 1 A (18 patients) where the ureter terminated in an ureterocoele and 1 B (10 patients) where the ureter was ectopic. Group 2 (3 patients) were cases where the non-functioning moiety was hypoplastic or dysplastic and was drained by a small or normal size ureter. The diagnostic value of IVU, Ultrasound, DTPA scan and MCU was reviewed in each group.