Idiopathic hypereosinophilic syndrome presenting with severe vasculitis successfully treated with imatinib

Figure 1 Bone marrow biopsy. A: Hematoxylin and eosin (H and E)-stained section of paraffin-embedded bone marrow showing expansion of the myeloid cellular line with marked increase in granulated eosinophilic cells (100 ×); B: High-power view of the diffuse eosinophilic infiltration (white arrows), without any detectable morphological signs of abnormal proliferation (400 ×).