Abstract
Unilateral atrophy of the masseter, temporal, medial pterygoid muscles, and the coronoid process is comparatively rare. We present such a case in a 58-year-old woman. She was referred to our department for examination of the left ramus of the mandible. Computed tomography (CT) and magnetic resonance imaging (MRI) revealed atrophy of the left masseter, temporal, and medial pterygoid muscles andthe coronoid process. Electromyography showed no potential in the masseter or temporal muscles. Themandible did not deviate to the right. Dental Prescale indicated that the masticatory ability was lower onthe left side. There was no facial assymetry or trismus. This condition seems congenital, and she may haveestablished her own masticatory movement.
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