Figure 1. Bone marrow biopsy reveals a hyper-cellular marrow with multiple non-caseating granulomas(arrows). Normal hematopoietic elements are evident in the remainder of the marrow. (H&E 10x)
Figure 2. Two large granulomatous lesions are present. The upper lesion is surrounded by a lymphoid aggregate as part of the granulomatous inflammatory reaction.
Figure 5. The lesions were negative for acid-fast bacilli on histochemical staining (Z-N 40x). Similarly, a histochemical stain for fungus was also negative (not shown).