Histopathology of eosinophilic granulomatosis with polyangiitis (Churg-Strauss)

Small artery in a patient with eosinophilic granulomatosis with polyangiitis (Churg-Strauss) showing intimal fibrinoid necrosis and mural infiltration by histiocytes consistent with a necrotizing granulomatous vasculitis. There is marked extravascular eosinophilia.