Figure 1. Normal Bone Marrow: Myelocytes, a metamyelocyte, a band, and several neutrophils are present. Eosinophils and nucleated red cells also are present.





Figure 2. Bone Marrow in Immune Neutropenia: Myelocytes, metamyelocytes, and many band forms are present. There is particular absence of mature neutrophils, suggesting a destructive neutropenia. Eosinophils and lymphocytes also are present.





Figure 3. Bone Marrow in Severe Congenital Neutropenia: Promyelocytes and myelocytes are predominant. There is one metamyelocyte, erythroblast, and eosinophil. There is a conspicuous absence of more mature neutrophilic forms such as bands and neutrophils.