Between the years 1976 and 1986, 94 patients ranging in age from 2 weeks to 60 years were referred for treatment of ureteropelvic junction obstruction. A dismembered pyeloplasty was performed in 85 patients, ureterocalycostomy in 4 patients and primary nephrectomy in 5 patients. Apart from aberrant vessels found in 14 patients and associated calculi in 12, clinical results were satisfactory in most of the patients (96.2%). The calyceal appearance on the postoperative excretory urogram showed diminution with good drainage in 53.8%, improvement of drainage in 42.3%, and deterioration in 3.8%.