The annual incidence of cholesteatoma ranges from 9 to 12.6 cases per 100,000 in adults and from 3 to 15 cases per 100,000 in children.[5] This varies both worldwide and with the population studied. In Scotland, an annual incidence of 13 per 100,000 of the population was noted for the period 1966 to 1986.[10] In Iowa, US, the overall incidence is 7 per 100,000 per year in children.[11] Congenital cholesteatoma is less common. For example, a study from Denmark reports an annual incidence of surgical treatment for congenital cholesteatoma of 0.12 per 100,000, compared to 2.3 per 100,000 for acquired cholesteatoma.[12]

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