Accuracy of diagnosis and counseling of fetal brain anomalies prior to 24 weeks of gestational age.

Objective: To evaluate the accuracy of prenatal neurosonography in diagnosing underlying causes of fetal ventriculomegaly, posterior fossa anomalies and microcephaly before 24 weeks' gestational age (GA) and to study the accuracy of prenatal counseling on postnatal prognosis.

Methods: A retrospective cohort study based on 146 cases of these fetal brain anomalies before 24 weeks' GA. Counseling on prognosis was compared with postnatal outcome.