The right cerebral hemisphere is diffusely enlarged with entire thickening and disorganization of the cortical grey matter (migration arrest). Abnormal high signal on FLAIR and T2WI throughout the white matter of the affected hemisphere. The ipsilateral lateral ventricle is dilated with abnormal morphology, abnormal structure and orientation of the right basal ganglia, dysgenesis of the corpus callosum, expanded right calvarium, contralateral displacement of the anterior falx, and extension across the midline of the right occipital lobe. The right cerebellar hemisphere is also enlarged with an abnormal cortex. The right half of the brainstem appears also mildly enlarged.
The left hemisphere appears normal.