Bypass Pyeloplasty for Ureteropelvic Junction Obstruction Associated with Horseshoe Kidney: A Case Report

INTRODUCTION: Horseshoe kidney (HSK) is the most common renal fusion and malrotation anomaly, and ureteropelvic junction obstruction (UPJO) due to high ureteral insertion (HUI) is frequently associated with HSK. Bypass pyeloplasty (BP) is a non-dismembered surgical technique involving a side-to-side anastomosis between the ureter just distal to the UPJO and the dependent portion of the hydronephrotic renal pelvis, and is suited for HUI. Although several procedures have been suggested for UPJO in HSK patients, BP has not been discussed much. In this case report, we describe the detailed procedure for BP successfully performed in an HSK patient with UPJO due to HUI.