Hydrocephalus is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Hydrocephalus, or a subtype of Hydrocephalus, affects less than 200,000 people in the US population.
6.46 per 10,000 births in the UK 2002 for hydrocephaly (University of Ulster, 2003) ... see also overview of Hydrocephalus.
approx 1 in 105,263 or 0.00% or 2,584 people in USA [Source statistic for calcuation: "6.46 per 10,000 births in the UK 2002 for hydrocephaly (University of Ulster, 2003)" -- see also general information about data sources]
2,584 per year, 215 per month, 49 per week, 7 per day, 0 per hour, 0 per minute, 0 per second. [Source statistic for calculation: "6.46 per 10,000 births in the UK 2002 for hydrocephaly (University of Ulster, 2003)" -- see also general information about data sources]
The following statistics relate to the incidence of Hydrocephalus:
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Hydrocephalus may result from an obstruction in CSF flow (noncommunicating hydrocephalus) or from faulty absorption of CSF (communicating hydrocephalus). (See Normal circulation of CSF.)
In noncommunicating hydrocephalus, the obstruction occurs most frequently between the third and fourth ventricles, at the aqueduct of Sylvius, but it can also occur at the outlets of the fourth ventricle (foramina of Luschka and Magendie) or, rarely, at the foramen of Monro. This obstruction may result from faulty fetal development, infection (syphilis, granulomatous diseases, meningitis), a tumor, cerebral aneurysm, or a blood clot (after intracranial hemorrhage).
In communicating hydrocephalus, faulty absorption of CSF may result from surgery to repair a myelomeningocele, adhesions between meninges at the base of the brain, or meningeal hemorrhage. Rarely, a tumor in the choroid plexus causes overproduction of CSF, producing hydrocephalus.
Hydrocephalus occurs most commonly in neonates but can also occur in adults as a result of injury or disease. It affects 1 of every 1,000 people.
Source: Professional Guide to Diseases (Eighth Edition), 2005
The term 'prevalence' of Hydrocephalus usually refers to the estimated population of people who are managing Hydrocephalus at any given time. The term 'incidence' of Hydrocephalus refers to the annual diagnosis rate, or the number of new cases of Hydrocephalus 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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