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Trismus due to bilateral mandibular coronoid hyperplasia.
  1. Wg Cdr A J Gibbons, MA (CANTAB), FDSRCS, FRCS, RAF, Specialist Registrar Oral & Maxilofacial Surgery1,
  2. Dr A J Byrne, MRCP, FRCS, Consultant Anaesthetist1 and
  3. Mr S J Key, FDSRCPS, FRCS, Staff Grade Oral & Maxillofacial Surgery1
  1. 1Morriston Hospital, Swansea, S. Wales, SA6 6NL


Bilateral mandibular coronoid hyperplasia is a rare cause of restricted mouth opening. Diagnosis of the condition prior to general anaesthetic is essential, as oral intubation may be impossible. The reported case illustrates the role of computed tomography in assessment of the disorder and effective treatment by coronoidectomy.

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