What sort of problem is an arnold-chiari malformation?

Brain malformation: Briana, a chiari malformation is a downward congenital (from birth) displacement of the lowermost part of the a part of the brain (the cerebellum) through the opening in the base of the skull. Several types with no symptoms to multiple symptoms such as neck pain, headaches, dizziness, loss of balance, numbness of limbs. May be associated with other structural changes in the spinal cord or brain.

Aquired also: Not all chiari type 1 is present at birth. This can be an aquired condition with some association with repeated lumbar puncture or spinal tap as well as lumbar peritoneal shunts. Generally the cerebellar tonsils rise above the foramen magnum over time as we age. Some skull bony abnormalities may make the compartment where the cerebellum sits smaller than normal and these can be present from birth.