uprightdoc wrote:If you look at the scan closely you will see that the space beneath the cerebellum is very small. If you look to the right of the round looking portion of the cerebellum at the bottom you will see a bright white spot. That bright spot is bone. It is the rear side of the foramen magnum. The front of the foramen magnum is just across from it. In this image it appears that the lower portion of the cerebellum, called the tonsils, has descended somewhat, albeit slightly, into the foramen magnum. Technically, it is called cerebellar tonsilar ectopia. It should be noted, however, that this image was taken supine and that the degree of descent most likely increases in upright posture. CTE can compress blood and CSF pathways between the cranial vault and spinal canal. It can also increase pressure on motor and sensory tracts of the brainstem and cord in the foramen magnum and upper cervical canal.
centenarian100 wrote:Location of the cerebellar tonsils < 3mm below the foramen magnus ("benign tonsillar ectopia") is normal
This is a very common incidental finding. The MRI posted reveals a large amount of T2 bright CSF around the upper cervical cord, cerebellum, and brainstem. There is a no syrinx or brainstem compression
Here is what cerebellar tonsilar herniation looks like:
Although, it is possible for minimal tonsilar ectopia to be associated with some chiari malformation related symptoms: (http://radiology.rsna.org/content/245/2 ... l.pdf+html)
NZer1 wrote:... Dr F do you know a Dr David Jernigan? I am not sure if he studied at Sherman but he is a Chiro in Kansas...
NZer1 wrote:Hi centenarian 100, quick question will the Upright MRI findings be identical to supine MRI findings
uprightdoc wrote:As I have mentioned many times on this thread - it's not the degree of descent that matters. What matters is whether or not it causes problems.
uprightdoc wrote: The signs and symptoms of Chiari 0 and Chiari 1 are similar to MS.
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