Diuretic ultrasound, described in Literature in the seventies from Rosenfield, is an effective technique if compared with the functional urodynamic study and the diuretic renography evaluation for the assessment of upper urinary tract obstruction. In our study we have compared the effectiveness of diuretic ultrasound with diuretic intravenous urography in the evaluation of obstructive pathology of ureteropelvic junction. The technique was performed on 47 patients 11 of whom were pediatrics making a total of 94 renoureteric units. Results show high sensibility of this technique either with severe obstructions (94\%) or moderate obstructions (96\%).
