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. 2023 May 20:1–31. Online ahead of print. doi: 10.1007/s12022-023-09771-3

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Fig. 23 — IgG4-related Hashimoto thyroiditis. An activated lymphoid follicle is evident, but the interstitial inflammatory infiltrate is mainly composed by mature plasma cells (A, B). Oncocytic changes of follicular thyroid cells is prominent (B). Interstitial plasma cells are IgG + (C), with numerous IgG4 + (D) plasma cells and an IgG4/IgG ratio > than 40%