Renal Duplex Collecting System in Port Harcourt: a Six-year Retrospective Review

ABSTRACT

Background: Duplicated collecting system (DCS) is a common congenital genitourinary anomaly which is usually detected on imaging studies performed for other reasons. It may be accompanied by various complications or associated with a variety of congenital genitourinary anomalies. Aim: To evaluate the incidence of duplication anomalies; the types of duplicated collecting systems; their complications and associated genitourinary congenital anomalies in Port Harcourt. Methods: This was a retrospective review of two thousand intravenous urogram (IVU) radiographs seen by the authors over a 6-year period; between 2000 and 2005 at Pix Centre; a private radiological centre in Port Harcourt; Nigeria. Results: Eighteen cases of DCS out of two thousand radiographs were seen in this period. Six (33.9) were males and 12 (66) were females. Sixteen (88.9) were unilateral and 2(11.1) were bilateral. Twelve (66.7) were on the right and 8(44.4) on the left. There was bifid pelvis in 1(5.6) and bifid ureters in 17(94.4). There was no complete duplicated collecting system. There was calyceal clubbing in 2(11). Ipsilateral ureterocele was noted in 1(5.6). The incidence of duplicated collecting system from our series was 0.9. Conclusion: Duplicated collecting system in our environment is relatively rare. The commonest type is of the bifid ureter (incomplete ureteral duplication). There is low rate of association with other serious congenital anomalies of the urogenital system. There is female preponderance with a female to male ratio of 21