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A 35-year-old member asked:

what are low lying cerebellar tonsils?

1 doctor answer2 doctors weighed in
Dr. Alan Ali
Dr. Alan Alianswered
Psychiatry 32 years experience
Tonsillar Herniation: It is result of brain herniation from increased pressure in brain which pushes the cerebellar tonsils down through the foramen magnum (opening in floor of skull where cerebellum comes through when pushed down). It is also called Chiari Malformation.

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A 35-year-old female asked:

Slightly low lying cerebellar tonsils, probably secondary to tonsilar ectopia?

1 doctor answer1 doctor weighed in
Dr. Thomas Benda, jr
ENT and Head and Neck Surgery 34 years experience
Not tonsils: The cerebellar tonsils are not tonsils, just part of your cerebellum. Sometimes when patients are dizzy it is due to pressure from a portion of the cerebellum resting low in the skull, around the foramen magnum. If a radiologist noted the cerebellar tonsils ride a little low, they might mention it in a report. It would not be that uncommon of a finding on a normal MRI or ct of the brain.
A 41-year-old member asked:

Can any doc tell me what does low lying cerebellar tonsils mean?

2 doctor answers3 doctors weighed in
Dr. Walter Husar
Neurology 33 years experience
Arnold Chiari: Low lying cerebellar tonsils refer to the presence of cerebellar tissue below the foramen magnum. Usually referred to as Arnold Chiari Type I, which are in general asymptomatic and seen as an incidental finding on MRI of the brain. Best to check with your doctor for certain.
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A 26-year-old female asked:

Can low lying cerebellar tonsils descend further?

1 doctor answer1 doctor weighed in
Dr. Reza Karimi
Neurosurgery 16 years experience
Yes: This can be progressive, especially if caused by a spinal problem like a tethered spinal cord or spinal fluid leak. Many times this does not progress however.

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Last updated Aug 9, 2019

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