Mandible and Maxilla

Mandibular defects include:

• micrognathia (small mandible),
• retrognathia (retruded mandible)
• temporomandibular joint (TMJ) defects. In severe cases, the mandibular condyle and glenoid fossa of the TMJ may be hypoplastic and sometimes absent.

Cleft palates and maxillary hypoplasia are not atypical, however they are less common features.