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Table 3 Chapel Hill Consensus Conference (CHCC) Nomenclature for Granulomatosis with Polyangiitis (GPA), Microscopic Polyangiitis (MPA) and Eosinophilic Granulomatosis with Polyangiitis (EGPA)
| GPA | |
| Extravascular necrotizing granulomatous inflammation of the upper and/or lower respiratory tracts | |
| Systemic necrotizing small vessel vasculitis | |
| Frequent necrotizing glomerulonephritis | |
| MPA | |
| Systemic necrotizing small vessel vasculitis | |
| Frequent necrotizing glomerulonephritis and pulmonary capillaritis | |
| No granulomatous inflammation | |
| EGPA | |
| Extravasal eosinophile-rich and necrotizing granulomatous inflammation of the respiratory tract | |
| With bronchial asthma and eosinophilia-associated systemic necrotizing small vessel vasculitis | |
| eosinophilic infiltrate (≥ 4 of 6 critera) |
