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Histopathologic feature (a) and immunohistochemical staining (b–d) of Case 2. (a) Lymphoplasmacytic infiltration with predominance of plasma cells and proliferation of myofibroblasts (H&E; original magnification ×200); (b) positive reaction of plasma cells for IgG κ (original magnification ×200); (c) positive reaction of plasma cells for IgG λ (original magnification ×200); and (d) negative reaction of spindle cells for smooth muscle actin (original magnification ×200).
