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. 2022 Jul 14;42(12):3869–3875. doi: 10.1007/s10792-022-02407-1

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Open AccessThis 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. 1 — Axial T1-weighted MRI (A) and fat-suppressed contrast enhanced T1-weighted MRI (B) showing the measurements of the right medial and lateral rectus muscles perpendicular to the muscle belly. Coronal T1-weighted MRI (C) showing the measurements of the superior muscle group, medial rectus, inferior rectus and superior ophthalmic vein. Fat-suppressed contrast enhanced T1-weighted MRI (D) showing the measurements of the medial rectus and superior muscle group