<unk>  () is a rare birth defect characterized by abnormal clefts lined with grey matter that form the ependyma of the cerebral ventricles to the pia mater. These clefts can occur bilaterally or unilaterally. Common clinical features of this malformation include epilepsy, motor deficits, and psychomotor retardation.
Schizencephaly
Megalencephaly
Hemihydranencephaly
Holoprosencephaly
Hemimegalencephaly
Lissencephaly
Microlissencephaly
Microhydranencephaly