显微镜下多血管炎(MPA)常累及肾、肺等全身多个器官。其临床表现复杂多变,易被误诊,为提高对本病的认识,现将我们收治的2例MPA误诊为肺纤维化、肺炎病例报告如下。1病历摘要例1:男,68岁。因头痛、纳差20 d余,伴发热、咳嗽10 d余。于2009-11-24入院。20 d前不明原因出现头皮疼, Microscopic vasculitis (MPA) often involving the kidney, lung and other multiple body organs. The clinical manifestations of complex and volatile, easily misdiagnosed, in order to improve the understanding of the disease, now we have 2 cases of MPA misdiagnosed as pulmonary fibrosis, pneumonia cases are as follows. 1 case summary 1: male, 68 years old. Due to headache, anorexia more than 20d, with fever, cough for more than 10d. Admitted to hospital on 2009-11-24. 20 d unexplained scalp pain,