Hypersensitivity vasculitis usually involve
Refer robbins 9/e p510, 8/e 515 Harrison 7/2128 Direct quote from Harrison 18th /2798; Postcapillary venules are most commonly involved vessels. Capillaries and aerioles are less frequent involved
Aerioles
Post capillary venules
Capillaries
Medium sized aeries
Cardiovascular system