A case of unilateral incomplete duplicated collecting system with ureteropelvic junction obstruction and renal pyelic fusion in a horseshoe kidney: A rare urinary tract malformation.

A 2-month-old girl with congenital hydronephrosis was presented. Magnetic resonance urography confirmed the presence of a horseshoe kidney and right-sided duplicated collecting system. Retrograde pyeloureterography revealed right ureteral stricture and fusion between the left and right lower poles of the renal pelvis. Because of recurrence of urinary tract infection, pyeloplasty and vesicoureteral neostomy were performed at 14 months of age. No significant postoperative complications were observed, and the hydronephrosis improved over the course of approximately 1 year.