Dandy-Walker malformation

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Dandy-Walker malformation is a distortion of the anatomy of the posterior fossa characterized by the following elements: the cisterna magna is expanded and the tentorium is displaced superiorly, the cerebellar vermis is rotated superiorly and this results in a posterior opening of the fourth ventricle; the vermis may be normal, hypoplastic or absent; the cerebellar hemispheres may be normal or hypoplastic; ventriculomegaly and other anomalies are frequent

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