Fetal hydronephrosis; prevalence, natural history and postnatal consequences in an unselected population

Abstract

Antenatal hydronephrosis was found in almost 1% (n=85) of the study population. There was an almost 2% risk of Down's syndrome in this group. The majority of cases had an increase in severity and some were stable in the antenatal period, but it was not possible to predict the individual postnatal outcome. In the group where the finding diminished in the antenatal period, no patient had an abnormal postnatal follow-up. Female fetuses with hydronephrosis seem to have an adverse postnatal outcome compared to male fetuses.