显微镜下多动脉炎(MPA)是属于系统性血管炎中一种较为独立与自身免疫有关的疾病,病例相对少见,早期诊断较为困难。发病初期病变往往局限于肾脏或以肾脏表现为首发症状,而临床表现与病理改变程度可不相一致,易与其他类型血管炎及肾脏炎性病变相混淆,所以,认识其肾脏病变的临床及病理特点,有利于提高对本病发生与发展的认识, Microscopic polyarteritis (MPA) is a systemic vascular disease is a more independent and autoimmune diseases, relatively rare cases, early diagnosis is more difficult. Early onset lesions are often confined to the kidney or renal manifestations as the first symptom, and clinical manifestations and pathological changes may not be consistent with other types of vasculitis and renal inflammatory lesions easily confused, so to understand the clinical and pathological features of renal disease , Is conducive to raising awareness of the occurrence and development of the disease,