Fig. 3

The examination of bone marrow revealed evident histiocytes with hemophagocytic activity (Hematoxylin and eosin stain; original magnification, 40 \(\times\)) (a), as were increased numbers of CD8+ T cells with modest cytological atypia (b). CD20.+ B cells (c) and positive Epstein–Barr virus–encoded RNA in situ hybridization were rare (d). (Hematoxylin and eosin stain, immunohistochemistry stain; original magnification, 20 \(\times\))