Final answer:
Vasculitis is classified based on the size of the blood vessels affected and the specific immune mechanisms involved. The two main types of vasculitis are small vessel vasculitis and medium and large vessel vasculitis.
Step-by-step explanation:
Vasculitis is classified based on the size of the blood vessels affected and the specific immune mechanisms involved. The two main types of vasculitis are small vessel vasculitis and medium and large vessel vasculitis. Small vessel vasculitis typically includes conditions like microscopic polyangiitis and granulomatosis with polyangiitis, while medium and large vessel vasculitis includes diseases like giant cell arteritis and Takayasu arteritis.