Microscopic polyangiitis (MPA), previously called hypersensitivity angiitis, is a systemic necrotizing vasculitis that involves many organ systems including the skin, joints, kidneys, and lungs.
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Confition in which the immune system causes the tissues of the joints to become inflamed, causing symptoms of muscle pain and stiffness. It seems to be associated with giant cell arteritis, a condition that causes the arteries to become inflamed.