Ophanet, a consortium of European partners, currently defines a condition rare when it affects 1 person per 2,000. They list Arachnoid Cysts as a "rare disease".
Source - Orphanet
Basauri, L, and Selman, J.
Intracranial Arachnoid Cysts.
Child's Nervous System, 8; 101-104 (1992).
Ciricillo, S, et al.
Intracranial Arachnoid Cysts in
Children. Journal of Neurosurgery, 74; 230-235 (February 1991).
Punzo, A, et. al.
Surgical Indications for Intracranial
Arachnoid Cysts. Neurochirurgia, 35; 35-42 (1992).
(Source: excerpt from NINDS Arachnoid Cysts Information Page: NINDS)
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