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40x magnification. (a) Bone marrow aspirate smear showing histiocyte with hemophagocytosis. (b) Bone marrow biopsy H&E stain showing foci of necrosis by normal bone marrow. (c) CD163 stain showing histiocyte engulfing other hematopoietic cell (rosette appearance). (d) FITE stain showing acid-fast bacilli.
