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. 2017 May 11;15:100. doi: 10.1186/s12957-017-1161-0

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© The Author(s). 2017

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 — Photomicrographs of specimens collected during the first surgery. a Resection specimen shows a tumour comprising haphazardly proliferating high-grade spindle cells and an extracellular eosinophilic osteoid-like matrix. b Resection specimen shows a hypocellular area with brisk mitotic activity. Haematoxylin and eosin staining, original magnification ×400 (a–b). c Immunostaining of a resection specimen with primary antibodies to CD34 shows diffusely positive cells. Original magnification ×400