What is poliomyelitis?

Polio-> Grey. Myel->Marrow. Itis->Inflame

inflammation of grey marrow

"Poliomyelitis is the inflammation of the anterior horns of the grey matter of the spinal cord, leading to a destruction of the large multipolar cells of these horns." -NMAH

In its most severe cases, Polio affects the CNS and eventually the brainstem