NCIt definition : A rare, autoimmune, systemic medium and small size vasculitis. It is characterized
by the formation of necrotizing granulomas in the respiratory tract, necrotizing angiitis,
and glomerulonephritis.;
Alternative definition : NICHD: Systemic vasculitis affecting small to medium-sized vessels, characterized
by necrotizing granulomas in the respiratory tract, necrotizing angiitis, glomerulonephritis
with little to no immune complex deposition, and typically positive for antineutrophil
cytoplasmic antibody staining in a cytoplasmic pattern (C-ANCA; antiproteinase 3).;