Isolated large fourth ventricle in early pregnancy--a possible benign transient phenomenon.


Twenty-one fetuses with an enlarged fourth ventricle were detected by ultrasound at 14-16 weeks' gestation. No other central nervous system anomalies were observed and a normal size fourth ventricle was noted in all cases on follow-up scans at 22-23 weeks' gestation. Five fetuses had associated structural anomalies: a single umbilical artery in two cases… (More)


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