Indications for cystography in children. Morphological abnormalities and functional defects

In children who have had UTI, in the presence of SMAs, prior determination of the maximum UOsm does not seem necessary to indicate a cystography. In patients who have not suffered from UTI, determining the maximum UOsm is useful for ruling out the presence of severe VUR. Renal tubular function tests, combined with other clinical, laboratory and sonographic variables, can guide decision-making to avoid unnecessary cystography.