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Fine needle aspiration biopsy in thyroiditis induced by immune checkpoint therapy. (A) Hematoxylin and eosin stained cell block, showing lymphohistiocytic aggregates (600×). (B) Papanicolaou stained ThinPrep showing necrotic cells with thyroid follicular cells rare to absent (600×). (C) Immunostain for CD163 (cell block) showing epithelial cells clustered with CD163+ histiocytes (600×).
