Causes of acute renal failure: ureteral calculi bilateral 40.8%, ureteral stones with single kiney 37.0%, ureteral stones plus renal stones on the other side: 7.4%, ureteral stones plus pyelostones were 3.7%, ureteral calculi plus stricture of pyelo-uretr junction on the other side (3.7%) and ureteral plus small kidney (7.4%).