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Figure 1: Definite vasculitis – active features (a) Vessel wall infiltrated by inflammatory cell infiltrate (H and E, ×100). (b) Disruption of endothelium and fragmentation of internal elastic lamina (H and E, ×40). (c) Fibrinoid necrosis (Masson trichrome, ×400). (d) Thrombus leading to luminal obstruction of the vessel (H and E, ×400)

Figure 1: Definite vasculitis – active features (a) Vessel wall infiltrated by inflammatory cell infiltrate (H and E, ×100). (b) Disruption of endothelium and fragmentation of internal elastic lamina (H and E, ×40). (c) Fibrinoid necrosis (Masson trichrome, ×400). (d) Thrombus leading to luminal obstruction of the vessel (H and E, ×400)