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A very rare developmental defect during embryogenesis with characteristics of varying degrees of congenital fusion (ranging from simple mucosal adhesions to extensive bony fusion) of mandible to maxilla that is not associated with any other malformations. Patients present with mouth opening limitation (which could range from severe to minimal restriction) that typically results in feeding, swallowing and/or respiratory difficulties that may lead to failure to thrive, malnutrition and/or temporomandibular joint ankylosis.
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