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- vermis hypoplasia with superior rotation of the vermian remnant associated with large posterior fossa cyst elevating the tentorium and straight sinus communicating with the fourth ventricle.
- marked dilatation of supra-tentorial ventricular system with free communication between the third and fourth ventricle and no aqueduct stenosis identified
- hypoplastic cerebellum with a winged appearance
- thinned occipital bone
- thinned, stretched and elevated corpus callosum
- widened supraoptic, infundibular and pineal recesses of the third ventricle
- flow void is noted at the cerebral aqueduct denoting patency
- wide foramina of Monro, foramen of Luschka and Magendie.
- no significant signal alteration of the white matter, no transependymal CSF permeation