To determine the sensitivity and specificity of multidisciplinary computed tomography in the diagnosis of ureteropelvic junction obstruction among patients undergoing retroperitoneal laparoscopic surgery at Viet Duc Hospital from 2012 to 2017. | The role of 64-slides computed tomography scan in preoperative diagnosis of retroperitoneal laparoscopic surgery for patients with ureteropelvic junction obstruction at Viet Duc hospital