What is the prevalence of autoimmune vasculitis in stroke population?
The overall prevalence of autoimmune vasculitis in stroke population is very low but age dependent. In cohorts of younger patients (eg, age <45 years), vasculitis may account for 0% to 20% of stroke cases, depending on the depth of workup. In older population, the proportion of strokes caused by vasculitis is smaller because of the increasing burden of aging-related risk factors.