Arnold-chiari malformations
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a physical problem present from birth in which part of the brain is pushed through the opening for the spinal cord at the base of the skull, blocking the flow of fluid into the brain and spinal cord
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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.
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