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. 2018 Jul 13;18:735. doi: 10.1186/s12885-018-4648-3

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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. 3 — Osteolytic lesions of the calcaneus with different radiographic appearance and varying aggressive behaviour: (a) Ewing sarcoma in a 31-year old male patient, (b) simple (calcaneal) bone cyst in a 11-year old male patient, (c) secondary squamous cell carcinoma based on chronic osteomyelitis in a 82-year old male patient and (d) low-grade chondrosarcoma in a 45-year old female