<unk>  is a type of cephalic disorder. It is a rare neural tube defect that combines extreme retroflexion (backward bending) of the head with severe defects of the spine.
Iniencephaly
Anencephaly
Hydranencephaly
Lissencephaly
Hemifacial microsomia
Megalencephaly
Holoprosencephaly
Microdontia