480476.fig.004a
(a)
480476.fig.004b
(b)
480476.fig.004c
(c)
480476.fig.004d
(d)
Figure 4: 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 (original magnification ×200); (c) positive reaction of plasma cells for IgG (original magnification ×200); and (d) negative reaction of spindle cells for smooth muscle actin (original magnification ×200).