Fig. 4

Histopathological features of the bone marrow. The figure demonstrates bone marrow findings for the patient with hematoxylin and eosin staining. a Overview of the bone marrow demonstrating hypercellular bone marrow with bone marrow cellularity of approximately 70%. b Encircled area displays groups of epithelioid cells consistent with granulomas. c Higher resolution demonstrating epitheliod cell granulomas located within the bone marrow. d Demonstrating granuloma with several giant cells present. e A significantly expanded erythropoiesis. f Several macrophages with intracytoplasmic residues of nuclear fragments consistent with hemophagocytosis (arrows)