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GPA
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Extravascular necrotizing granulomatous inflammation of the upper and/or lower respiratory tracts
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Systemic necrotizing small vessel vasculitis
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Frequent necrotizing glomerulonephritis
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MPA
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Systemic necrotizing small vessel vasculitis
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Frequent necrotizing glomerulonephritis and pulmonary capillaritis
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No granulomatous inflammation
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EGPA
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Extravasal eosinophile-rich and necrotizing granulomatous inflammation of the respiratory tract
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With bronchial asthma and eosinophilia-associated systemic necrotizing small vessel vasculitis
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eosinophilic infiltrate (≥ 4 of 6 critera)
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