Focal motor seizures mimicking hemifacial spasm.

A young female patient, who presented acutely with an unusual movement disorder characterized by hyperkinetic facial movements, was referred to us for hemifacial spasm. The only abnormality on neurological examination was myoclonus of the left perioral and bilateral periorbital muscles, exacerbated by mental tasks. A week later, the patient also presented two generalized tonic-clonic seizures on awakening and was successfully treated with antiepileptic drugs. Laboratory and neuroimaging investigations yielded normal findings. Although we were unable to identify a cortical generator, the concomitant occurrence of generalized seizures, the disappearance of symptoms after treatment and the topography of the myoclonus support an epileptic origin of this myoclonus.