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Cell block sections (hematoxylin and eosin stain). (a) Atypical lymphoid cells, scarce small lymphocytes, and mesothelial cells. (b) Common immunoreactivity with CD20 in atypical cells. (c) Negative reaction with CD3 in atypical cells. (d) Bcl-1 (cyclin D1): focal nuclear immunoreactivity in atypical lymphoid cells.
