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Images 10.104.1A: Large-vessel vasculitis, venous + 10.104.1B: Mixed-cell infiltrate of inflammatory cells throughout the entire width of a thickened wall of a muscle-containing vessel + 10.104.1C + 10.104.1D = Phlebitis  Elastic tissue stain fails to demonstrate an internal elastic membrane, an indication that the vessel is a vein, not an artery.