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IgG4-related lung disease photomicrographs (a) Heavily inflamed lung parenchyma (Hematoxylin-eosin stain, original magnification,×25) (b,c) Dense lymphoplasmacytic inflammatory infiltrate within the lung parenchyma (Hematoxylin-eosin stain, original magnification in b, ×100; and in c,×200) (d) Focus of obliterative phlebitis (Hematoxylin-eosin stain, original magnification, ×200).
