Nonutility of routine prone filming in adult urography

The relative value of prone and supine filming in excretory urography was prospectively evaluated in 100 unselected, adult, high-dose urograms. The supine radiographs were superior or equal to prone radiographs in all cases. Significant findings were limited to the supine radiographs in six cases. Findings were seen on both supine and prone radiographs, but the supine radiograph was clearly better in nine cases. Major urinary structures were shown to better advantage on supine films, and the prone film was subject to radiographer error in a higher number of cases.