Unilateral schizencephaly

Unilateral schizencephaly (type 2). MR images of a 4-year old child with focal epilepsy and developmental delay. Axial T2-weighted (A, B) and coronal inversion recovery (C, D) images show a CSF cleft with closely opposed borders lined with polymicrogyria. There is also a small area of gliosis in the white matter of the contralateral paracentral lobule (arrow in A).The septum pellucidum is absent and the fornices lie abnormally low (arrow in D). No other brain abnormalities were present.