[Drainage by echo-guided nephrostomy in hydronephrosis secondary to a pyelo-ureteral junction in a single kidney syndrome in a pregnant woman. Apropos of a case].

We report an exceptional case of pyeloureteral malformation which occurred on a single kidney. The malformation was discovered at 32 week of gestation when ultrasonography showed hydronephrosis. Initial treatment consisted in echoguided drainage. The patient gave birth to a live infant via normal vaginal delivery and then underwent resection of the pyeloureteral malformation with anastomotic reconstruction of the upper urinary tract.