Early-onset progressive encephalopathy with migrant continuous myoclonus

Definition

A rare infantile epilepsy syndrome characterized by early-onset progressive encephalopathy with migrant, continuous myoclonus. The focal continuous myoclonus (lasting from dozens of minutes to hours) is observed in the first months of life. During disease progression, prolonged bilateral myoclonic seizures and generalized tonic-clonic seizures occur and eventually progressive encephalopathy with hypotonia and ataxia is observed. All patients reported to have cortical atrophy. There have been no further descriptions in the literature since 1996.