<prompt> ANCA positive vasculitis isChurg-strauss syndromePolyaeritis nodosaWegener granulomatosis1 3  <response>: Wegener granulomatosis is likely to be initiated as a cell mediated hypersensitivity response directed aganist inhaled infectious or environmental antigens. PR3-ANCA are present in almost 95 co of cases Chrug - stauss syndrome is a small vessel necrotising vasculitis classically associated with asthma, allergic rhinitis, lung infiltrate, etc. This syndrome may stem from hyperresponsiveness to normally innocuous allergic stimuli. MPO-ANCA s are present in a minority of cases Robbins 9 th edition page no. 354 