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The word myokymia, derived from the Greek myo -muscle and kymos -wave, describes involuntary, continuous, slow, undulating contractions of muscle fibres. 1 Electromyography of myokymia consists of short lived and often recurrent bursts of single motor unit potentials, firing at rates of 2-60 Hz. 2 Myokymia can be focal or generalised and is usually associated with diffuse, central or peripheral nerve disorders. We describe a case of bilateral lower limb myokymia due to a focal lesion at the conus medullaris.
CASE REPORT
We report the case of a 69-year-old man who initially presented 26 years ago with bilateral involuntary twitching in the quadriceps muscles in the absence of muscle atrophy or hypertrophy. Neurological and systemic examination was otherwise normal and he did not complain of sweating or muscle stiffness. There was no family history to note.
Electromyography revealed continuous, spontaneous, involuntary, repetitive motor unit activity...