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Chiari Malformation (pathophysiology (compression of medulla and upper…

- - - - 5mm descent of the caudal tip of the cerebellar tonsils past the foramen magnum
    - - most severe
      - associated with myelomeningocele
      - brainstem, fourth ventricle, and >5mm descent of caudal tip of cerebellar tonsils past the foramen magnum with spina bifida
    - - herniation of the cerebellum with or without the brainstem through a posterior encephalocele
    - - cerebellar hypoplasia or aplasia with normal posterior fossa and no hindbrain herniation
- - - - hand weakness
      - dissociated sensory loss
      - asymmetrical 2 to syrinx