predominantly small-vessel vasculitis Anti-neutrophil cytoplasmic antibody-associated vasculitis AAV ANCA-associated vasculitis GARD:0013011 Group of systemic vasculitis with a strong association with anca. The disorders are characterized by necrotizing inflammation of small and medium size vessels, with little or no immune-complex deposits in vessel walls. MESH:D056648 MONDO:0015492 Orphanet:156152 UMLS:C2717865 antineutrophil cytoplasmic antibody-associated vasculitis secondary interstitial lung disease in childhood and adulthood associated with a systemic vasculitis