Histopathologic findings. (A–I) Follicular hyperplasia (2X, H&E); (B) paracortical expansion (2X, H&E); (C) PTGC-like features (2X, H&E); (D) CD8⁺ T cells (2X); (E) CD8⁺ T cells in GC (10X); (F) IRF4+ plasma cells in GC (10X); (G) PD1+ T cells (10X); (H) pDCs CD163+ (10X); (I) pDCs CD303+ (2X). H&E, hematoxylin and eosin.