Viral encephalitis

  • Patchy, asymmetrical
  • Prefers grey matter
  • Herpes: anterior temporal and inferior frontal cortical region
  • Limbic encephalitis: herpes involvement of hippocampi and cingulate gyrus
  • EBV: patchy enhancement and edema
  • Widespread hemispheric involvement: Coxsackie, entero and echo viruses
  • Thalamic and upper brain stem involvement, often hemorrhagic: Japanese encephalitis and West Nile virus
  • Cerebellitis: ADEM, pertussis, lead poisoning, vasculitis