PMC9112304_01
Macrophage in bone marrow (Giemsa, 100x).
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The bone marrow aspiration smear was hypocellular but there was an increase in macrophages (Figure 1).
Fibrin-ring granulomas in bone marrow (HE, 40x).
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On the bone marrow biopsy slide, many fibrin ring granulomas were seen (Figure 2), suggesting Q fever.