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 …