Pelviureteric obstruction in children: the effect of pyeloplasty on 99mTc-DTPA uptake and washout.

The renographies of 23 children, treated by means of dismembered pyeloplasty for unilateral pelviureteric obstruction, were analysed. Computerised 99mTc-DTPA renography was performed on each patient both preoperatively and on one or several occasions postoperatively. Of the 13 hydronephrotic kidneys, which had normal glomerular function preoperatively, 12 had also normal postoperative function. In a large proportion of those hydronephrotic kidneys which had reduced glomerular function preoperatively, the function improved after pelviureteroplasty. The improvement was most pronounced in the group of kidneys with severely reduced preoperative glomerular function. The effect of pelviureteroplasty on the washout of DTPA was examined in 13 patients who had diuretic renograms performed both preoperatively and postoperatively. Improved drainage of the hydronephrotic kidney after pyeloplasty was noticed in all these cases.