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. 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. In Iowa, US, the overall incidence is 7 per 100,000 per year in children. 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.
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