<prompt> All of the following are small vessel vasculitis, Except:Wegners granulomatosisMicroscopic polyangitisPolyaeritis NodosaHenoch-Schonelin purpura  <response>: Answer is C Polyoeritis Nodosa:Classic Polyaeritis nodosa does not involve capillaries and venules and is classified as a medium vessel vasculitis.Micorscopic polyangitis Microscopic PAN,Wegeners granulomatosis and Henoch Scholein purpura are all classified as small vessel vasculitis. 