Prevalence and Incidence of Moyamoya Disease
Prevalance of Moyamoya Disease:
rare ... see also overview of Moyamoya Disease.
Moyamoya Disease: Rare Disease
Moyamoya Disease is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Moyamoya Disease, or a subtype of Moyamoya Disease,
affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners,
currently defines a condition rare when if affects 1 person per 2,000.
They list Moyamoya Disease as a "rare disease".
More information about Moyamoya Disease is available from Orphanet
About prevalence and incidence statistics:
The term 'prevalence' of Moyamoya Disease usually refers to the estimated population
of people who are managing Moyamoya Disease at any given time.
The term 'incidence' of Moyamoya Disease refers to the annual diagnosis rate,
or the number of new cases of Moyamoya Disease 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.