ABSTRACT
Radionuclide studies are inaccurate in the presence of infection and vesico-ureteric reflux. In infants in whom a postoperative ultrasound scan shows no improvement, a MAG3 scan may help to distinguish between persistent obstruction and cystic dysplasia. The uptake is negligible in dysplasia. Postoperatively, a renogram should be performed to assess the differential glomerular filtration rate, which will also give useful information with regard to obstruction at the VUJ.
