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. 2021 Jun 30;21:204. doi: 10.1186/s12890-021-01570-y

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Hematoxylin and eosin sections (original magnification ×200). Slices with H&E staining were observed under the NIKON TE2000-U microscope(10×eyepiece, 20×objective lens). Photos were captured through a CCD digital camera involved in NIKON TE2000-U microscopic platform. Typical photos were recorded by NIKON NIS-Elements software V4.2. a CT-guided percutaneous lung biopsy. The tissue cut by fine needle was composed of atypical epithelioid neoplasm cells organized in a squamous carcinoma pattern. b EBUS-TBNA. Squamous cell clusters mixed in the mediastinal lymph node tissue of the N7 group aspirated by the fine needle