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. 2020 Jul 6;50(1):87–95. doi: 10.1007/s00256-020-03530-9

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — A 42-year-old male amateur marathon runner with 5 years of running experience, a running pace of 5:20 min/s/km, a weekly running distance of 65 km, and a non-rearfoot strike pattern. A Axial fat-suppressed T₂-weighted imaging (fs-T₂WI) showing fluid in the tendon sheath of the posterior tibialis tendon (grade 1), flexor digitorum longus tendon (grade 0), and flexor hallucis longus tendon (grade 2) (from the inside to the outside; arrow). B Sagittal fs-PDWI showing effusion in the flexor hallucis longus tendon sheath (grade 2; arrow)