Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Arachnoid Cysts as a "rare disease". More information about Arachnoid Cysts is available from Orphanet
The term 'prevalence' of Arachnoid Cysts usually refers to the estimated population of people who are managing Arachnoid Cysts at any given time. The term 'incidence' of Arachnoid Cysts refers to the annual diagnosis rate, or the number of new cases of Arachnoid Cysts diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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