Gray matter heterotopia and cerebellopontine angle arachnoid cyst


The grey matter heterotopias are a relatively common group of conditions characterized by interruption of normal neuronal migration from near the ventricle to the cortex, thus resulting in "normal neurons in abnormal locations".

Sinus pericranii is a cranial venous anomaly in which there is an abnormal communication between intracranial dural sinuses and extra-cranial venous structures, usually via an emissary transosseous vein. This case shows findings that suggest this condition, although further study with contrast should be done for confirmation. 

Lateral ventricles dilatation are not associated with other changes related to hydrocephalus, may denoting a poor white matter development.