Polioencephalitis is a viral infection of the brain, causing inflammation within the grey matter of the brain stem. The virus has an affinity for neuronal cell bodies and has been found to affect mostly the midbrain, pons, medulla and cerebellum of most infected patients.

What is the meaning of Polioencephalitis?

: inflammation of the gray matter of the brain.

What is Polioencephalomyelopathy?

: inflammation of the gray matter of the brain and the spinal cord.