Electrical status epilepticus “invisible” to surface EEG in late‐onset Rasmussen encephalitis

Abstract

Rasmussen's encephalitis (RE) is a chronic, progressive disease that typically occurs in childhood, rarely in adulthood. When it does occur in adulthood, it may be associated with atypical electro‐clinical features, and neuroimaging alterations usually help diagnosis. Unlike childhood forms, in which epilepsia partialis continua is usually observed, the EEG pattern in adult variants may be aspecific. We describe a highly interesting case of late‐onset RE in which an electrical status epilepticus was not detected by the surface EEG, but by a recording with subdural electrodes.