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Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) are rare autoimmune diseases, including granulomatosis with polyangiitis (GPA), microscopic polyangiitis (MPA) and eosinophil granulomatosis with polyangiitis (EGPA). They are three distinct diseases with overlapping symptoms and signs. The ANCAs involved in AAV are mainly directed against myeloperoxidase (MPO) and proteinase
