Chiari malformation

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Chiari malformation is a developmental abnormality of the brain.

Classification

Numbered from least severe to most severe:

  • Chiari type I - tonsils herniated[1] (radiologic definition: 4-6 mm below the plane of the foramen magnum).
    • Associated with: sudden death, sleep apnea, cerebellar ataxia.
  • Chiari type II - often assoc. with hydrocephaly at birth.
  • Chiari type III - cerebellum + brain stem herniate through foramen magnum +/- encephalocele.[2]
  • Chiari type IV - cerebellar hypoplasia or no cerebellum.

References

  1. ↑ URL: http://rarediseases.info.nih.gov/GARD/Disease.aspx?diseaseID=9230. Accessed on: 6 May 2011.
  2. ↑ URL: http://www.ninds.nih.gov/disorders/chiari/detail_chiari.htm. Accessed on: 6 May 2011.
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