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. 2017 Oct 5;7:12727. doi: 10.1038/s41598-017-13097-6

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Distortion artefact in active surveillance. 66 year old patient on active surveillance. PSA 6.02 ng/ml at enrolment MRI 2014 (a,d), and stable at follow-up imaging in 2015 (b,e) and 2016 (c,f). Top row T2-weighted imaging, bottom row ADC maps. 2015 study included within current cohort shows posterior warping with apparent new and marked restricted diffusion (arrow), this is artefactual and not present on subsequent follow-up imaging.