Pelvi-ureteric junction obstruction in Singapore children--a retrospective study.

Thirty-two cases of hydronephrosis caused by pelvi-ureteric junction obstruction, presenting to the Department of Paediatric Surgery in the last 6 years were reviewed. In both infants and older children a palpable abdominal mass was the most common mode of presentation. Anderson-Hynes pyeloplasty was performed in a total of 31 kidneys. In 4 children, whose kidneys were severely hydronephrotic and with hardly any renal parenchyma present a primary nephrectomy was performed. Of the two children who required further operation on the same kidney, a repeat pyeloplasty for persistent obstruction was required in 1 patient, the other patient underwent nephrectomy subsequent to pyeloplasty as a severe pyonephrosis had developed. Twenty-nine of the 31 kidneys were assessed postoperatively by tube nephrogram, intravenous pyelogram (IVP), or diuretic renography. Four kidneys were found to be non-functional or severely damaged.