 6. UTU: UTU is conducted by using same model of ultrasound machines with a 3.0-5.0 MHz frequency probe throughout this study. We will provide enough water to drink and all participants are required to have moderate bladder filling. Initially, participants lay in a prone position for scanning of bilateral kidneys and upper ureters. Then participants will turn to a supine position to have lower ureters and bladder scanned. The position is adjusted if necessary to achieve successful scanning. Details of the abnormalities are record including stone size, number, location, depth of hydronephrosis mm. The longest axis of the stone in millimeter mm is used for the stone size. And also all the children which are found with urinary abnormalities are asked to undergo a Non-enhanced helical CT scans with two-mm slices in the First Peoples Hospital of Kashgar area. 