Prenatal diagnosis of fetal brain ventricle dilatation.

In a 13 month prospective screening programme 3120 pregnant women were examined with diagnostic ultrasound at 17 and 32 weeks gestation; five fetuses (0.16%) were found with dilatation of brain ventricles. Early diagnosis was made in one patient resulting in legal termination of the pregnancy. The four other patients were diagnosed at the second ultrasound examination.