Idiopathic masseter muscle hypertrophy is a rare condition, characterized by unilateral or bilateral enlargement of this muscle, sometimes associated to mandibular angle exostosis.(1) Its etiology is unknown, and there is a possible relation with unilateral masticatory activity, dental malocclusion, temporomandibular joint dysfunction, bruxism, or emotional alterations.(2,3)The diagnosis is made primarily based on the clinical presentation, complemented with ultrasound and, if required, magnetic resonance imaging.(3) It is important to make differential diagnoses with tumors or inflammatory processes in muscles, bones and salivary glands.
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