Granulomatosis with Polyangiitis (GPA) and Microscopic Polyangiitis (MPA)

GPA and MPA are both forms of vasculitis, which is a group of rare, chronic autoimmune disorders that causes inflammation of the blood vessels. This inflammation can restrict blood flow and inflict serious damage to vital organs and tissues, such as the sinuses, lungs, kidneys, skin, joints, and nerves.