Hemifacial microsomia (otomandibular dysostosis) is due to asymmetric abnormal development of the first and second branchial arches. It primarily affects the ear, mandible, maxilla, muscles of mastication and soft tissues of the lower face of the affected side. It may also involve the eye, other parts of the skull, as well as nerves and soft tissue. | Dr Mostafa Mahmoud El-Feky

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