Complete pelviureteric junction obstruction following a diuretic renal scan.

A 13-day-old neonate with a single functioning, hydronephrotic kidney developed complete pelviureteric junction (PUJ) obstruction and anuria following a diuretic radionuclide renal scan. Urgent pyeloplasty resulted in a favourable outcome. Possible dynamics of the obstruction are discussed. Monitoring urine output after diuretic renal scans, especially in infants with a single functioning kidney and PUJ obstruction, is of paramount importance.