anti-neutrophil cytoplasmic antibody-associated vasculitis (Monarch Disease Ontology entry MONDO_0015492) is 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. Also known as: AAV, ANCA-associated vasculitis, antineutrophil cytoplasmic antibody-associated vasculitis.