In an introduction the authors take into consideration the term Hydronephrosis and then they reviewed indications for a correction-repair of a pyelo-ureteral segment. There is shortly presented what is to be expected from an "ideal" procedure for a such reconstruction and then the operative technique of Anderson-Hynes method is described. They have operated on 37 patients using this procedure and according to X-ray finding (Degree of dilatation of calices and pyelon) patients were divided into four groups. Of primary importance in the evaluation of end results are: X-ray finding, urine analysis and subjective feeling. According to these criteria an excellent result has been attained in 15 patients, very good in 5, rather good in 8, while in 4 the result was bad; 5 patients were lost to follow-up.
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