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Myokymia is an involuntary spontaneous quivering or twitching of muscles. It is most often temporary and benign but is well-known to occur in demyelinating polyneuropathies.
This video shows myokymia of the masseter and temporalis muscles in a 24-year-old woman with chronic inflammatory demyelinating polyneuropathy (CIDP) associated with systemic lupus erythematosus (SLE)–Sjögren overlap syndrome. It is unusual because, to our knowledge, bilateral myokymia of trigeminal nerve-innervated muscles has not been described. The latter part of the video shows myokymic discharges in the patient’s left masseter muscle on electromyography.
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