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Thyroglossal tract cyst is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Thyroglossal tract cyst, or a subtype of Thyroglossal tract cyst, 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 Thyroglossal tract cyst as a "rare disease". More information about Thyroglossal tract cyst is available from Orphanet
The term 'prevalence' of Thyroglossal tract cyst usually refers to the estimated population
of people who are managing Thyroglossal tract cyst at any given time.
The term 'incidence' of Thyroglossal tract cyst refers to the annual diagnosis rate,
or the number of new cases of Thyroglossal tract cyst 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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