A rare syndromic type of cerebral malformation with characteristics of aprosencephaly (absence of telencephalon and diencephalon), oculo-facial anomalies (such as ocular hypotelorism or cyclopia, malformation/absence of nasal structures, cleft lip), preaxial limb defects (such as hypoplastic hands, absent halluces) and various other anomalies including ambiguous genitalia, imperforate anus, and vertebral anomalies.

A rare genetic non-syndromic central nervous system malformation with characteristics of absence of the telencephalon and absent or abnormal diencephalic structures, combined with severe abnormalities of the mesencephalon and cerebellum. Further malformations, for example of the hands and feet, have been described in addition.