- Trecher Collins Syndrome is an abnormal development of the 1st pharyngeal arch
- Causes mandibulofacial dysostosis (mongoloid features of the face)
- Trecher Collins syndrome is a defect in the migration of neural crest cells to the craniofacial region
- Characteristics of trecher collins syndrome include underdevelopment of zygomatic bone, a small mandible, and malformed ears.
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