Bone marrow is hypo-, normo- or hypercellular with reactively changed hematopoiesis and possibly slight dysplastic changes. It also contains an increased number of macrophages with abundant soft granular eosinophilic cytoplasm in which erythrocytes and other hematopoietic cells are phagocytosed (erythrophagocytosis, hematophagocytosis).
Hemophagocytic syndrome, bone marrow: Hemophagocytic syndrome, bone marrow, HE 100x (72631) Hemophagocytic syndrome, bone marrow, CD68 100x (72630)