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. 2022 Jun 7;28(21):2396–2402. doi: 10.3748/wjg.v28.i21.2396

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©The Author(s) 2022. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/

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Fine needle biopsy findings. A: Proliferation of small to medium-sized cells arranged in a nest pattern was evident, the cells occasionally showed small nucleoli (dots), mitotic figures (arrows), and intra-cytoplasmic hyaline globules (encircled), hematoxylin and eosin original magnification (O.M) × 40; B: Chromogranin A (CgA) positivity of neoplastic cells; inset: Synaptophysin positivity of neoplastic cells, CgA stain, O.M. × 20; B inset, synaptophysin stain, O.M. × 20; C: AE1/AE3 cytokeratins expression in scattered cells, cytokeratin AE1/AE3 stain, O.M. × 20; D: S100 negativity, S100 stain, O.M. × 20).