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. 2016 Aug 14;6:14. doi: 10.1186/s13569-016-0054-2

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© The Author(s) 2016

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. 2 — a CT axial image shows a primarily sclerotic lesion involving the diploe (white arrow) extending across the midline (black arrow). b There is a polypoid mass in the right frontal sinus (asterisk). c Sagittal reconstruction shows the lesion (white arrows) and the polypoid mass (asterisk)