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November 1985

Trismus: An Unusual Sign in Polymyositis

Author Affiliations

From the Department of Neurology, University of Kansas Medical Center, and the Neurology Service, Kansas City Veterans Administration Medical Center, Kansas City, Mo. Dr Chikarmane is now in private practice in Hazelton, Pa.

Arch Neurol. 1985;42(11):1116-1118. doi:10.1001/archneur.1985.04060100102032

• Neuromuscular disease is an unusual cause of trismus. However, we describe two patients with severe polymyositis who had difficulty opening their mouths during the acute phase of the illness. Electromyography demonstrated involvement of the masseters, and there was no evidence of myasthenia. The mechanism appeared to be decreased elasticity of the masseter because of inflammation, edema, and perhaps contractures.

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