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. 2017 Jun 28;9(6):269–279. doi: 10.4329/wjr.v9.i6.269

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©The Author(s) 2017. Published by Baishideng Publishing Group Inc. All rights reserved.

Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (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: http://creativecommons.org/licenses/by-nc/4.0/

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N descriptors. A: Primary tumor and N2: FDG-avid left upper lobe lung mass (arrowhead) invading the prevascular region of the mediastinum with adjacent FDG-avid level 6 lymph nodes suggesting nodal metastases (arrows); B: N1 and N2: Level 10L (white arrow), and 3A (blue arrow) enlarged lymph nodes with increased FDG avidity (N1 nodal metastases) and similar level 7 (yellow arrow) lymph nodes suggesting N2 nodal metastases; C: N3: FDG-avid left supraclavicular lymph node (arrow) suggesting N3 nodal metastases.