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Histopathological and immunohistochemical features of the nasal tumor. A: Dense lymphoplasmacytic infiltration is observed under the ciliated epithelium, HE, x 100. B: Dense lymphoplasmacytic infiltration is also observed around the nasal glands. Lymphocytes and plasma cells are without atypia. Obliterative phlebitis (arrow, inset), HE, x 200. C: Abundant IgG4-positive plasma cells have infiltrated into the lesion, x 400.
