How long vasculitis lasts depends on its cause. For example, most cases of hypersensitivity vasculitis or Kawasaki disease go away on their own over a period of days or weeks. Granulomatosis with polyangiitis (Wegener's) Wegener's granulomatosis may respond to treatment at first, but many patients relapse and require treatment again. Giant cell arteritis typically requires therapy for a year or more.
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