Highlights
MMTAH is a new clinical entity, misdiagnosed as temporomandibular joint disorder.
MMTAH is diagnosed based on a square mandible, cord-like masseter muscle aponeurosis, and limited mouth-opening.
Aponeurectomy combined with coronoidectomy is the treatment of choice for a better prognosis.
It is important to evaluate the patient’s compliance with mouth-opening training before surgery.
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