Postinfectious myelitis, encephalitis and encephalomyelitis.

Six cases of post-infectious encephalomyelitis are described. A preceding non-specific viral-like illness occurred 4 to 20 days before the onset of the neurological deficits. The clinical syndromes included transverse myelitis, focal encephalitis and encephalomyelitis (each in one case) and diffuse encephalitis in 3. Magnetic resonance imaging appeared to be the investigation of choice. High dose corticosteroids were given to 4 patients who recovered partially or fully. The patient with focal encephalitis had a spontaneous and complete recovery. The remaining patient with diffuse encephalitis died 3 days after the onset; autopsy showed prominent lymphocytic perivascular cuffing in the white matter and lymphocytic infiltration of the meninges.