<unk> , or<unk>  deficiency, is an underdevelopment of the bones of the upper jaw. It is associated with Crouzon syndrome, Angelman syndrome, as well as fetal alcohol syndrome. It can also be associated with cleft lip and cleft palate. Some people could develop it due to poor dental extractions.
Maxillary hypoplasia
Hypodontia
Anodontia
Hemifacial microsomia
Condylar hypoplasia
Micrognathism
Iniencephaly
Thumb hypoplasia