label: Antineutrophil Cytoplasmic Antibody-Associated Vasculitis
label_lc: antineutrophil cytoplasmic antibody-associated vasculitis
description: A group of rare autoimmune disorders characterized by small-to-medium vessel vasculitis and the presence of anti-neutrophil cytoplasmic autoantibodies (ANCA). Some cases may be associated with infection or the use of certain medications.