Page 40 - SONO 260 The Fetal Head and Brain

CEREBRAL MALFORMATIONS DANDY-WALKER MALFORMATION & MEGA CISTERNA MAGNA
¢Dandy-Walker malformation (DWM) is actually a classification within a larger group of anomalies referred to as the Dandy- Walker complex.
— Dandy-Walker complex is a spectrum of posterior fossa abnormalities that involve the cystic dilatation of the cistern magna and fourth ventricle.
— DWM is thought to be caused by a developmental abnormality in the roof of the fourth ventricle.
— The sonographic findings of DWM include the presence of an enlarged cisterna magna that communicates with a distended fourth ventricle through a defect in the cerebellum.