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Chronic lymphocytic leukemia involving the breast. (a) Lymphocytic infiltrate is seen involving the stroma and adipose tissue (core biopsy, hematoxylin & eosin stain, 40x magnification). (b) Atypical small round monomorphic lymphocytes are present surrounding a benign duct (core biopsy, hematoxylin & eosin stain, 400x magnification).
