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. 2019 Oct 17;48:51. doi: 10.1186/s40463-019-0372-5

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© The Author(s). 2019

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. 4 — Photomicrographs from a case of PTC, tall cell variant. In this case, tall cell features (i.e. tumour cells 2 or 3 times taller than wide) were present both on the FNA material a and b, Cell block, H&E), which was classified as Malignant-PTC (Bethesda VI), and on the corresponding resection specimen (c and d, H&E). The tumour cells also show classical nuclear features of PTC including several intranuclear pseudoinclusions (arrows in A). Extrathyroidal extension was present (D, H&E) with several clusters of tumour cells (arrows) invading skeletal muscle. Molecular testing revealed BRAF V600E mutation