Rabies encephalomyelitis vs. ADEM: Usefulness of MR imaging in differential diagnosis.

We report a case of rabies encephalomyelitis in a 12-year-old boy who had received anti-rabies vaccine 6 weeks after being bitten by a puppy. The MR (magnetic resonance) imaging helped to differentiate rabies from acute disseminated encephalomyelitis (ADEM). ADEM involves the white matter predominantly, whereas rabies has a predilection for grey matter, that too of midline regions. This report emphasizes the usefulness of MRI in differentiating rabies and ADEM when encephalomyelitis occurs in a vaccinated child.