[The use of technetium 99m with diethyleneamino pentaacetic acid (Tc 99-DTPA) in the pathology of the pyeloureteral junction].

By using diuretic renograms with technetium 99m-diethylenetriaminepentaacetic acid (Tc 99-DTPA) as a non-invasive procedure to evaluate paediatric patients with pelvicaliceal dilatation, we are able to make a clear differentiation between dilated, obstructed and non obstructed renal units. This procedure has given us a new insight into the management of these patients, permitting us to decide which patients would benefit from a surgical treatment and which patients would be reserved for clinical observation and follow up.