Abstract
Cases (31) of hydronephrosis caused by pelviureteric obstruction were treated during the last 12 yr at the Saint-Vincent de Paul Hospital, Paris [France]. There were only 3 bilateral cases but a significant number of contralateral anomalies. No primary nephrectomy was done, but 2 children had a secondary nephrectomy. Evaluation of late results showed practically no change from the early postoperative urogram; scintigram proved a useful adjunct for assessment of renal function. A further study will be necessary to make sure that the results remain stable in adult life.

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