Microscopic polyangiitis is a systemic necrotizing vasculitis with mainly renal and pulmonary manifestations. It can be distinguished from other forms of small vessel vasculitis by the absence of granuloma formation, the relative lack of upper airway involvement, and by the predominance of myeloperoxidase for perinuclear antineutrophil cytoplasmic antibody staining. The radiologic features of microscopic polyangiitis reflect the presence of diffuse alveolar hemorrhage.
KeywordsGround Glass Opacity Diffuse Alveolar Hemorrhage Small Vessel Vasculitis Fibrinoid Necrosis Renal Manifestation
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