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. 2020 Feb 13;20:55. doi: 10.1186/s12883-020-01637-z

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© The Author(s) 2020

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 — Histology of the biopsy specimen (Hematoxylin and eosin stain) with intrafascicular tumour cells (asterisk) surrounded by collagen fibres (a). Epithelial membrane antigen staining is positive in tumour cells (asterisk) (b). S100 is not expressed in tumour cells but shows entrapped Schwann-cells in pseudo-onion bulbs (asterisk) (c). Immunohistochemical staining for Ki-67 reveals only very few proliferating tumour cells (asterisk) (d)