PMC9946802_01
Computed tomography images. (A) swollen lymph nodes in the retroperitoneum (red arrow). (B) Swollen lymph node in right armpit (red circle). Swollen lymph nodes in the mediastinum (blue triangle). (C) Magnification x20. Lymphoid follicular hyperplasia. (D) Magnification x100 high endothelial venules with angiogenesis, infiltration of plasma cells and eosinophils, and localized fibrosis.
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Chest and abdominal computed tomography (CT) showed multiple enlarged lymph nodes in the retroperitoneum (Figure 1A), right axilla and mediastinum (Figure 1B), the largest of which was 2.0 by 1.8 cm.  Histopathological examination of lymph node biopsy tissue from the right neck revealed the lymph node structure is preserved and the subcortical area is dominated by Lymphoid follicular hyperplasia (Figure 1C) with background eosinophil deposition. The paracortical area between the germinal center and the follicles has marked high endothelial venules with angiogenesis, infiltration of plasma cells and eosinophils, and localized fibrosis (Figure 1D).