We report on a 76-year-old man with bilateral hydronephrosis and acute renal failure initially managed with a bilateral percutaneous nephrostomy (PCN). An antegrade pyelogram showed bilateral stricture of the lower ureters. A foreign body was found in the urinary bladder by kidney-ureter-bladder (KU B) film and sonography. Computed tomography revealed that the object had penetrated the urinary bladder wall into the peritoneal cavity. On surgical exploration, we found a stone-encrusted disrupted Foley catheter. Postoperatively, sonography revealed mild residual hydronephrosis. Bilateral ureteral stricture might have been the result of foreign body-induced inflammation of the bladder wall. However, the bilateral hydronephrosis spontaneously resolved after removal of the foreign body, after which the PCN tubes were successfully removed.