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(A) A biopsy from the armpit masses showed small- to medium-sized atypical lymphocytes with mantle zone growth and partial nodular growth (hematoxylin and eosin stain, magnification ×400). Immunohistochemistry analysis showed that the tumor cells were positive for (B) CD5, (C) CD20, and (D) cyclin D1 (all, magnification ×400).
