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Figure 2: Photomicrographs showing. (a and b) Diffuse infiltration by atypical lymphoid cells in the sub-epithelial region at places infiltrating the overlying epithelium. Tumor cells are two to three times the size of a mature lymphocyte with some showing irregular nuclear contours, coarse chromatin and inconspicuous nucleoli and scanty to a moderate cytoplasm (H and E, ×100 and ×200), (c and d) the tumor cells were strongly and diffusely positive for CD3, and negative for CD20 (CD3 and CD20 Immunostain, ×200)

Figure 2: Photomicrographs showing. (a and b) Diffuse infiltration by atypical lymphoid cells in the sub-epithelial region at places infiltrating the overlying epithelium. Tumor cells are two to three times the size of a mature lymphocyte with some showing irregular nuclear contours, coarse chromatin and inconspicuous nucleoli and scanty to a moderate cytoplasm (H and E, ×100 and ×200), (c and d) the tumor cells were strongly and diffusely positive for CD3, and negative for CD20 (CD3 and CD20 Immunostain, ×200)