Treatment of Granulomatosis with Polyangiitis and Microscopic Polyangiitis

Granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA) are two major clinical entities recognized among ANCA-associated vasculitides. GPA and MPA differ in the presence or absence of granuloma, organ involvement, and risk of relapses. GPA is more often, but not exclusively,