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Baby colic at Curlie
However, with treatment most individuals with symptomatic arachnoid cysts do well.More specific prognoses are listed below:

Patients with impaired preoperative cognition had postoperative improvement after surgical decompression of the cyst. Surgery can resolve psychiatric manifestations in selected cases. Epidemiology
Arachnoid cysts are seen in up to 1.1% of the population with a gender distribution of 2:1 male:female. 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. See also
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