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. 2018 May 22;12:136. doi: 10.1186/s13256-018-1671-6

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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. 5 — The resected lung specimen resembled the previous distal cholangiocarcinoma. Histopathological examination (H&E staining) of the lung tumor showed tumor cells forming irregular tubular structures with a lepidic pattern (a, original magnification × 10; b, original magnification × 200). Immunohistochemically, the tumor cells were positive for cytokeratin 7 (c, original magnification × 200) and CDX-2 (d, original magnification × 200) and negative for thyroid transcription factor 1 (e, original magnification × 200), napsin A (f, original magnification × 200), and cytokeratin 20 (g, original magnification × 200)