Chiari 2 malformation

  • Protrusion of tonsils > 5 mm below foramen magnum
  • Herniation of fourth ventricle and cerebellar vermis below foramen magnum
  • Small posterior fossa
  • Cerebellar hemisphere can herniate superiorly through tectorial incisor
  • Hypoplastic corpus callosum
  • Tectal plate is beaked
  • Brain stem is flattened and compressed
  • Low torcula
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Wolpert, Samuel M., et al. “Chiari II malformation: MR imaging evaluation.” American journal of neuroradiology 8.5 (1987): 783-792.