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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)

From: Cerebral involvement in systemic vasculitides

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)