Ureteropelvic junction obstruction unmasked after correction of vesicoureteral reflux using endoscopic treatment with Deflux

A case of intermittent ureteropelvic junction obstruction unmasked after correction of vesicoureteral reflux using endoscopic treatment with Deflux is presented. The difficulty in diagnosis and making treatment decisions for patients with coexisting ureteropelvic junction obstruction and vesicoureteral reflux is discussed.