[Encephalitis lethargica].

We report the case of a 34-year old patient who first complained of fever, confusion and transient ophthalmoplegia and then developed akinetic mutism, frontal lobe, pyramidal tract and extrapyramidal signs. Clinical and electrophysiological data support a diagnosis of encephalitis lethargica. Magnetic resonance imaging showed hyperintensive lesions in various brain regions. The patient responded to corticosteroid treatment. Two years after the onset of the first clinical signs he had recovered completely and today, after 5 years, he shows no sign of disease.