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. 2018 Sep 14;18:32. doi: 10.1186/s40644-018-0165-5

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 2 — A representative case of regional LN metastasis predicted by optimal SUV_max cut-off values, but not by the fixed SUV_max cut-off value of 2.5. (a) A mildly hypermetabolic lymph node (arrow) was observed in the left perirectal region. The long-axis diameter of the LN was 6 mm, and the patient was classified into the small LN group according to the size criteria. (b) The SUV_max of the LN was 1.8, and exceeded the optimal SUV_max cut-off value of 1.1. Histopathologic examination revealed that the lesion was a metastatic LN