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Non-invasive techniques have revolutionized the treatment of ureteral stones. We report the success rate and the complication rate of ureteral calculosis treatment with ureterorenoscopy. From November 1990 to April 1994 we have treated 121 patients with URS. In all cases we have used a 12.5 F. “Wolf” rigid ureteroscope. 85 patients (70.2%) were treated with ultrasonic lithotripsy; 36 (29.7%) with a Dormia basket; and in 16 cases a combined treatment of both procedures was employed. Complete stone removal was obtained in 96 patients (79.3%) but six of these required further endoscopic treatment. The complication rate was 7.4 per cent (9 patients) and two patients (1.6%) needed open surgery. In our experience ureteroscopy is a good approach to the treatment of ureteral stones.