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The medical records-linkage system of the Mayo Clinic was used to identify cases of idiopathic intracranial hypertension in the 15-year period,1976 through 1990,among the population of Rochester,Minn.Nine patients(eight women and one man)were identified,corresponding to an average annual age- adjusted incidence rate per 100000 of 0.9 for the total and 1.6 for the female population.In females aged 15 to 44 years,idiopathic intracranial hypertension occurred at a rate of 3.3 per 100000 per year;for those defined as obese(body mass index>26),the rate rose to 7.9.Median follow-up was 2.7 years(range,5 months to 15 years).Three of 18 eyes developed visual impairment;this was mild in all cases. |
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