Now called Chiari ll
A retrospective look has taken arnold's name away.
There are two main types of chiari malformations that are not really related to each other. Chiari 1 affects adults and is the result of a small brain compartment that forces the cerebellar tonsils through the foramen magnum. Chiari 11 affects children
from birth and is associated with a myelomeningocele at birth. The brainstem itself is altered.