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Arnold-Chiari malformation(Type I)

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A Type I Arnold-Chiari malformation is characterised by descent of the cerebellar tonsils into the spinal canal. It may be asymptomatic.

In symptomatic patients, it is associated with:

  • spinal diseases - 50% of cases:
    • syringomyelia
    • hydromyelia

  • cranial disorders - 10% of cases:
    • obstructive hydrocephalus

Last reviewed 01/2018


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