PMC3983676_01
Hemimasticatory Spasm in a 62-year-old Female.. The patient presents involuntary contraction of the right temporal and masseter muscles.
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Electromyography (EMG) of the right masseter and temporalis muscles revealed spontaneous activity consisting of repetitive, spontaneous bursts of motor unit discharges, ranging from 100 to 200 Hz (Figure 1).