Pyeloureteral junction stenosis and ureteral valve causing hydronephrosis.

A young female patient underwent ureteral resection and Hynes-Anderson pyeloureteroplasty because of pyeloureteral junction stenosis and a ureteral valve (UV), which caused hydronephrosis. Despite using ultrasonography and intravenous urography the ureteral valve was observed only on exploration. UV should be considered as a possible cause of upper urinary tract obstruction; retrograde urography can be essential.