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. 2019 Mar 7;13:71. doi: 10.1186/s13256-018-1965-8

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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. 1 — a Cellular neoplasm with sheets of pleomorphic round cells with hyperchromatic nuclei; × 40, hematoxylin and eosin. b Positive staining for neuroendocrine marker synaptophysin in the tumor cells; × 40. c Neuroendocrine CD56 positivity in the tumor cells; × 40. d Immunohistochemical findings; × 40. Dot-like cytokeratin (AE1/AE3) stain of tumor cells