Chiari Malformations

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Characteristics of Chiari Malformations

Chiari Type Features
0
  • Syrinx w/o tonsillar herniation
I (MC)
  • Tonsillar herniation >5 mm (basion-opisthion line)
  • HCP & brain anomalies are uncommon
  • Syrinx common
I.5
  • Tonsillar herniation w/o syrinx
II
  • vermis, brainstem & 4th vent. herniation
  • assoc. w/ MMC & multiple brain anomalies
  • syrinx & HCP very common
III
IV
  • Hypoplasia/aplasia of cerebellum & tentorium
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