Antenatally diagnosed fetal hydronephrosis. Five year's follow up.

Over a one year period 13 fetuses with urinary tract abnormalities were detected by antenatal ultrasound. Extra-renal dilatation was found in six, in two abnormalities requiring an intervention after delivery. Intra-renal hydronephrosis was present in five cases, of which three required surgery during the neonatal period to relieve the obstruction. Other abnormalities detected were one case with unilateral multicystic kidney and one case with small dysplastic kidneys. Multicystic kidney was removed and the infant with dysplastic kidneys died soon after delivery. Our limited numbers of antenatally detected hydronephrosis will point to the early diagnosis and intervention to avoid renal damage.