Overview

Chiari malformation

Chiari malformation (kee-AH-ree mal-for-MAY-shun) is a condition in which brain tissue extends into your spinal canal. It occurs when part of your skull is abnormally small or misshapen, pressing on your brain and forcing it downward.

Chiari malformation is uncommon, but increased use of imaging tests have led to more frequent diagnoses.

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