Figure 2

Histopathological findings of affected lymph node. A: In a low-power field, the affected lymph node showed discreet areas of necrosis paracortex (Hematoxylin-eosin stain, 10X). B: In a high-power field, the lesion demonstrated abundant karyorrhectic debris with apoptosis bodies and numerous histiocytes and large lymphoid cells (arrows). There were no neutrophils in the lesion (Hematoxylin-eosin stain, 100X). C: Giemsa stained section highlighted the plasmacytoid dendritic cells cluster (arrowheads) at the margins of the necrotic foci (may-Giemsa stain, 100X). D: Immunostain demonstrated that many histiocytes in the necrotic area were positive for myeloperoxidase (60X). E: Portions of the hystiocytes were stained with CD68 (60X). The scale bars in each panel indicate 10 μm, except for panel A (50 μm).