Alteration of the morphology and conformation of cortical gyri of the cerebral hemispheres, compromising the frontoparietal regions, more evident on the left.
CSF split delimited by heterotopic gray matter extending from the lateral surface of the left cerebral hemisphere communicating with the lateral ventricle (open lip). Similar change is seen on the right, but without communication with the ventricular system (closed lip).
The septum pellucidum is absent.