Arachnoid cyst epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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Epidemiology

Arachnoid cysts are seen in 4% of the population. Only 20% of these have symptoms, usually from secondary hydrocephalus.

A study that looked at 2,536 healthy young males found a prevalence of 1.7% (95% CI 1.2 to 2.3%). Only a small percentage of the detected abnormalities require urgent medical attention.