Endopyelotomy for treatment of ureteropelvic junction obstruction caused by torsion of a renal allograft

Ureteral obstruction is the most common urological complication following r enal transplantation. The obstruction most often occurs distal, secondary t o ureteral ischemia and fibrosis or extrinsic compression. Rarely the level of obstruction occurs at the ureteropelvic junction. We report a case of t orsion of a renal allograft causing ureteropelvic junction obstruction that was successfully treated endourologically.