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The vallecular tissue has benign stratified squamous epithelium with the underlying stroma diffusely infiltrated by neoplastic lymphoid cells (H&E, 200x). The neoplastic cells are monotonous and medium cell size. The inset: They are composed of centrocytes displaying cleaved nuclei, inconspicuous nucleoli and scanty cytoplasm. Some mitotic figures are present (arrow). Reactive small lymphocytes are interspersed in between the neoplastic cells (H&E, 400X).
