What are small vessel vasculitis autoimmune vasculitis?

ANCA-associated vasculitis (necortizing vasculitis, no immune complex deposition, specific for myeloperoxidase or proteinase 3 ANCA, cases of ANCA negative may occur in eosinophilic granulomatosis with polyangiitis, can occur only in a single organ especially renal limited AAV) Microscopic polyangiitis (necortizing vasculitis, glomerulonephritis (rapid progression), pulmonary capillaritis, ANCA + >90%, negative angiogram) Granulomatousis with Polyangiitis/ Wegners (necoritzing vasculitis, small-medium sized vessels, granulomatous inflammation of upper and lower respiratory tracts and glumoerulonephritis, ANCA +>80%, overlaps with MPA, anti-MPO/PR3) Eosinophilic granulomatosis with polyangiitis/Chrug-Stauss (eosinophilic rich necrotizing vasculitis, chronic rhinosinusitis, asthma, blood eisonphilia, ANCA+>40%, less common glomerulonephritis)