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. 2017 Nov 15;9(1):47–58. doi: 10.1007/s13244-017-0579-9

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© The Author(s) 2017

Open Access This 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.

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Fig. 9 — Partial response after anti-TNF therapy. a Axial T2-weighted sequences at baseline show a complex bilateral trans-sphincteric fistula with posterior “horseshoe” fluid. Hyperintense paths are present both near the external opening and at the intersphincteric level (arrows). b Axial T2-weighted sequences after 24 weeks of treatment reveal that the distal part of the fistula shows signs of healing (hypointensity); however, the intersphincteric fluid collection persists (arrow)