Hemophagocytosis on bone marrow aspirate and biopsy. (A) Two examples of hemophagocytic macrophages identified on bone marrow aspiration (Wright-Giemsa stain). (B) CD163 staining of bone marrow biopsy section highlights hemophagocytosis (counterstained with hematoxylin). Images were taken on a Nikon Elipse microscope (panel A: 100×/10; panel B: 20×/10) without oil, with a Spot digital camera. Images are unmanipulated. Courtesy of Dr Jun Mo.