<unk>  can be caused by many factors, particularly genetic variations. These include 18p-, 14q deletion, 13q deletion, and some vertically transmitted infections. It is part of a group of defects called holoprosencephaly.
Cebocephaly
Plagiocephaly
Otocephaly
Colpocephaly
Ethmocephaly
Trigonocephaly
Dolichocephaly
Oxycephaly