PMC6593924_01
Bone marrow: morphology suspicious for a lymphoproliferative disorder.
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Bone marrow: CD20 staining.
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Immunohistochemical analysis of atypical lymphocytes was strongly positive for CD20 (Figure 2) without co-expression of CD5 or CD10.
Bone marrow: cyclin D1 staining.
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Additional immunostains of atypical lymphocytes showed expression of BCL-2 protein and cyclin D1 (Figure 3).