Chiari malformation

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Definition

Chiari malformation is a condition in which brain tissue protrudes into your spinal canal. It occurs when a portion of your skull is abnormally small or misshapen, pressing on your brain and forcing it downward. Although Chiari malformation is uncommon, it's now diagnosed more frequently, largely due to improved imaging tests.

Chiari malformation is usually present at birth (congenital), but it can develop in some children after they are born. Signs and symptoms may not occur until adulthood.

Doctors categorize Chiari malformation into several types, depending on the amount of brain tissue that is pushed down into the spinal canal, and whether developmental abnormalities of the brain or spine are present. The more common types are less severe and involve less displaced tissue. Other types are rare and more severe.

Treatment for Chiari malformation depends on its severity and the characteristics of your condition. Regular monitoring, medications and surgery are all treatment options.

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Symptoms