Ureterocalicostomy abbreviated as UCO is a procedure used to anastomose non-dilated healthy ureter that is close to the lower calyceal system. This is exposed via amputation of the most dependent portion of the lower pole of the kidney, in order to bypass severe per pelvic fibrosis with ureteropelvic junction obstruction or a long proximal ureteral stricture if the renal pelvis is scarred or intrarenal in location.