Not Chiari: In Chiari malformation, a small part of the cerebellum protrudes through the bottom opening of the skull called the foramen magnum into the cervical spine where the spinal cord starts. This can cause neurological symptoms including headache. Based upon your description the radiologist thinks the position of the tonsils are not bad enough to call it a Chiari, also called "ectopic tonsils."
Answered 10/10/2017
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Specific measrement: Arnold chiari malformation is defined by specific measurement of the low lying cerebellar tonsils. If on mri you do not qualify do not worry
Answered 4/5/2015
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