显微镜下多血管炎(microscopic polyangiitis,MPA)是一种主要累及小血管的系统性坏死性血管炎。可侵犯肾脏皮肤和肺等脏器的小动脉、微动脉、毛细血管和微小静脉。常表现为坏死性肾小球肾炎和肺毛细血管炎。因其主要累及包括静脉在内的小血管,故现多称为MPA。男女比约2∶1,国外发病率为(1～3)/10万,我国的发病率尚不 Microscopic polyangiitis (MPA) is a systemic necrotizing vasculitis that mainly affects small blood vessels. Can invade the kidneys, skin and lungs and other organs of arteries, arteries, capillaries and tiny veins. Often manifested as necrotizing glomerulonephritis and pulmonary capillary inflammation. Because it mainly involves the small blood vessels, including the veins, it is often referred to as MPA. Male to female ratio of about 2: 1, the incidence of foreign (1 ~ 3) / 100,000, the incidence of our country yet