Dandy-Walker malformation with dysgenesis of the corpus callosum and arachnoid cyst
Increased head circumference with axial hypotonia.
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MRI sequences demonstrate an enlarged posterior fossa with cystic dilatation of the 4th ventricle, communicating with an enlarged posterior peri-cerebellar space through a vermian hypoplasia. Mild anterolateral displacement of the cerebellar hemispheres. Dilatation of the 3rd, and lateral ventricles with dysgenesis of the corpus callosum. Extra-axial cystic lesion of CSF signal on all sequences is noted in the left middle cerebral fossa (arachnoid cyst).