Hydronephrosis due to uroteropelvic junction obstruction is a well recorgnized and common disorder of children and young adults. Its clinical charateristics are vague generalized symptoms, so early detection is not easy. We reviewed fourty five cases of hydronephrosis due to ureteropelvic junction obstruction in the Department of Urology, Chungnam National University, from January, 1981 to December, 1990.
The results are as follows；
1. Age distribution of hydronephrosis was 20 cases in old aged group(above 20 years old), 10 cases in 1st decade, 9 cases in 2nd decade and 6 cases in infants. Sex distribution was 28 cases(62.2％) in male and 17 cases(37.8％) in female(male to female ratio was 1.6：1).
2. Of 45 cases, 39 cases(98.7％) were unilateral and 6 cases(1.3％) were bilateral. Left kidney was more involved than right.
3. Associated diseases were 13 cases(28.9％), of which congenital anomalies were 6 cases, such as horseshoe kidney(3 cases), ureterocele(1 case), complete duplicated ureter(1 case) and contralateral renal hypoplasia(1 case), and acquired diseases were 7 cases, such as pyonephrosis(3 cases), stone(3 cases) and spontaneous renal rupture(1 case).
4. The operative methods were nephrectomy(23 cases), pyeloplasty(22 cases), isthmectomy(3 cases) and partial nephrectomy(1 case).
5. The pyeloplasty was successful in 19 cases(86.4％).
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