Takayasu's arteritis is a rare disease. Its distribution is worldwide, although most cases are reported in Asian populations. The reported incidence in the US is 2.6 cases per million population per year in Olmsted County, Minnesota, and in Sweden the incidence has been estimated to be 1.2 cases per million population per year.[5][9] These figures are likely to underestimate the true prevalence of the disease. Autopsy studies in Japan suggest a higher incidence, with evidence of Takayasu's arteritis in 1 in every 3000 autopsies.[10]

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