<prompt> Which among the following is ANCA negative?Wegeners granulomatosisMicroscopic polyangitisPolyarteritis nodosaChurg-Strauss syndrome  <response>: Ans: c PAN Ref: Robbins, 7th ed, p. 539 Harrison, 16th ed, p. 2002PAN has no association with ANCAMore about PAN: Vasculitis of medium sizedsmall muscular arteries sparing pulmonary circulation Characteristic -- All stages of inflammation coexist in different vessels.Microaneurysms 1 cm - but not pathognomonic 30 patients have hepatitis B Ag in their serum MC organ system involved -- musculoskeletal renal MC cause of death -- gastrointestinal Involvement of venules is suggestive of microscopic polyangitis 