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  • Title: Trismus Due to Bilateral Coronoid Hyperplasia.
    Author: Choi MG, Kim DH, Ki EJ, Cheon HM.
    Journal: Maxillofac Plast Reconstr Surg; 2014 Jul; 36(4):168-72. PubMed ID: 27489829.
    Abstract:
    Bilateral coronoid hyperplasia causes painless progressive trismus, resulting from coronoid process impingement on the posterior aspect of the zygomatic bone. The etiology of coronoid hyperplasia is unclear, with various theories proposed. An endocrine stimulus, increased temporalis activity, trauma, genetic inheritance and familial occurrence have all been proposed, but no substantive evidence exists to support any of these hypotheses. Multiplanar reformatting of axial scans and 3-dimensional reconstruction permit precise reproduction of the shape and size of the coronoid and malar structures, and relationships of all structures of the temporal and infratemporal fossae. This case shows remarkably increased mouth opening by coronoidectomy in a patient who complained of trismus due to hyperplasia of coronoid process.
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