Arnold-Chiari malformation epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Fahimeh Shojaei, M.D.

Epidemiology and Demographics

Prevalence

• The prevalence of Arnold Chiari malformation is unknown since most of the cases are accidentally found
• It is believed that approximate prevalence is 0.1 to 0.5 percent worldwide.

Mortality rate

• The mortality rate of Arnold Chiari malformation depends on the subtype.
• Type 3 has the highest mortality rate as a result of respiratory failure in infancy

Age

• Arnold Chiari malformation commonly affects adolescence and adulthood, but also has been seen in younger children.

Race

• There is no racial predilection to Arnold Chiari malformation.
• Arnold Chiari malformation usually presents with back pain in whites and lower extremity weakness in African-Americans.

Gender

• [Disease name] affects men and women equally.
• [Gender 1] are more commonly affected by [disease name] than [gender 2]. The [gender 1] to [gender 2] ratio is approximately [number > 1] to 1.