A 56-year-old woman presented with bilateral hydronephrosis and moderate renal insufficiency. A diagnosis of bilateral ureteral obstruction and low-compliance bladder following pelvic irradiation was made by urological examinations. She underwent gastrocystoplasty to facilitate bilateral ureteral reimplantation with an uneventful postoperative course. We consider that the use of the stomach to reconstruct the urinary tract injured by pelvic irradiation is valuable to avoid an abdominal urinary stoma.