Ureterocalicostomy (UCO) is a procedure used to anastomose nondilated healthy ureter proximal to the lower calyceal system, which is exposed via amputation of the most dependent portion of the lower pole of the kidney, in order to bypass severe peripelvic fibrosis with a ureteropelvic junction (UPJ) obstruction or a long proximal ureteral stricture if the renal pelvis is scarred or intrarenal in location.