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Figure 3: (a) Histology showing the mass characterized by diffused lymphoplasmacytic infiltration (magnification, ×100) (b) anti immunoglobulin antibody staining showing immunoglobulin positive plasma cells (magnification, ×200) (c) anti immunoglobulin G4 antibody staining showing immunoglobulin G4 positive plasma cells (magnification, ×400). The immunoglobulin G4/immunoglobulin positive cell ratio was >40%

Figure 3: (a) Histology showing the mass characterized by diffused lymphoplasmacytic infiltration (magnification, ×100) (b) anti immunoglobulin antibody staining showing immunoglobulin positive plasma cells (magnification, ×200) (c) anti immunoglobulin G4 antibody staining showing immunoglobulin G4 positive plasma cells (magnification, ×400). The immunoglobulin G4/immunoglobulin positive cell ratio was >40%