• The possibility of hypertrophy of the masseter muscle as a result of abnormal use is illustrated by two case histories. A young woman had consulted many doctors because of a painless swelling below and anterior to the left ear. It was found to be caused by an extraordinary amount of grinding of teeth, which continued during sleep and had visibly worn down her teeth. A man whose complaints were earache and swelling about the jaw was found similarly to give both subjective and objective evidence of habitual grinding. The possibility of a benign hypertrophy of this sort must be kept in mind, because in one case there had been fear of a tumor and in the other a diagnosis of external ear infection had been made.
Barton RT. BENIGN MASSETERIC HYPERTROPHY: A SYNDROME OF IMPORTANCE IN THE DIFFERENTIAL DIAGNOSIS OF PAROTID TUMORS. JAMA. 1957;164(15):1646–1647. doi:10.1001/jama.1957.02980150014004
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