Comparing Different Diameter fURSs With Similar RESDs for the Treatment of Upper Urinary Tract Stones

Exclusion Criteria

• •1.Patients with a history of ureteral stenosis or who have undergone open or laparoscopic ureteral or renal lithotomy.
• •2.Patients with fever one week before surgery 3.Pregnant women and menstruating patients. 4.Patients with combined systemic disease or inability to tolerate anesthesia. 5.Patients undergoing simultaneous surgery for bilateral upper urinary tract stones.
• •6.Patients with ureteral stent indwelling before surgery. 7.In patients with severe hydronephrosis, the separation of the renal collecting system is greater than 4 cm.
• •8.Patients with renal anatomic malformations such as polycystic kidney, horseshoe kidney, and ectopic kidney.