Chiari Malformation is also known as Arnold-Chiari malformation, hindbrain herniation, and tonsillar ectopia. It is a congenital abnormality regarding the skull. The skull may be misshapen or too small, which results in part of the brain pressing on the base of the skull and extending into the spinal canal, which is generally part of the cerebellum. Chiari malformation is classified based on its severity and the part of the brain which protrudes into the spinal canal, ranging from 1 to 4.
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Source: Medscape, National Institute of Health: National Institute of Neurological Disorders & Stroke
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