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Immunostaining of FNA samples of the right supraclavicular lymph node (H&E stain 200× magnification). (A, C) Positive TTF-1 staining on FNA specimen. (B) FNA specimen with ALK stain positive. (D) FNA specimen with ALK stain negative. (A) and (B) were taken on January 2, 2019, and (C) and (D) were taken on December 8, 2020. FNA, fine-needle aspiration; H&E, hematoxylin and eosin.
