How common is Chiari Malformation?

By  ,  Onlymyhealth editorial team
Dec 28, 2012

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Quick Bites

  • In this condition, the brain tissue extends to the spinal cord.
  • It is a rare condition.
  • The condition is categorized into three types.
  • The malformation may create pressure and crowd your brain.

A condition in which the brain tissue extends to the spinal cord is known as chiari malformation. It occurs when part of you’re the skull is abnormally small or misshapen, pressing the brain downwards.


chiari malformation


It is a rare condition. However, the increased use of diagnostic imaging has shown that CM may be much more common. Complicating this estimation is the fact that some children who are born with the condition may not show symptoms until adolescence or adulthood, if at all. CMs occur more often in women than in men and Type II malformations are more prevalent in certain groups, including people of Celtic descent.

The condition is categorized into three types depending on the anatomy of the brain tissue which gets displaced into the spinal canal and whether developmental abnormalities of the brain or spine are present.

Chiari malformation type I takes place when the section of the skull containing a part of the brain is too small in size or is deformed. This could create pressure and crowd your brain. The lower part or tonsils or the cerebellum are displaced into the upper spinal canal.

Chiari malformation type II is almost always associated with a form of spina bifida called myelomeningocele.




Read more articles on Chiari Malformation.



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