<unk>  is characterized by an unusually small mandible, posterior displacement or retraction of the tongue, and upper airway obstruction. Cleft palate (incomplete closure of the roof of the mouth) is present in the majority of patients. Hearing loss and speech difficulty are often associated with<unk> .
Pierre Robin sequence
First arch syndrome
Roberts syndrome
XK aprosencephaly
Cleidocranial dysostosis
Spina bifida
Marden–Walker syndrome
Trismus pseudocamptodactyly syndrome