Hemorrhagic encephalitis

Also called brain purpura , pericapillary encephalorrhagia) is incorrectly called hem encephalitis. Clinically one sees difuse encephalopathy, no cells in CSF, diagnosis is pathologic not imaging or clinical. Lesions are confined to callosum, centrum ovale and middle cerebellar peduncles. Origin is obscure. Occassionally, it may complicate viral pneumonia, uremia, arsenical intoxication or metabolic encephalopathy

Differentiate from acute hemorragic leukoencephalitis (Hurst type) which is an extreme form of ADEM.