What are Chiari malformations?

Chiari malformations are structural defects in the base of the skull and cerebellum, the part of the brain that controls balance.  Normally the cerebellum and parts of the brain stem sit above an opening in the skull that allows the spinal cord to pass through it (called the foramen magnum).  When part of the cerebellum extends below the foramen magnum and into th...

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