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. 2021 Oct 5;11:19717. doi: 10.1038/s41598-021-99201-3

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© The Author(s) 2021

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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Representative cases of temporalis muscle thickness (TMT) on CT and MRI, and its association with progression-free survival. A 72-year-old female was diagnosed with nasal cavity cancer (cT2N0M0) (a, arrow). Her baseline TMT was measured as 4.22 mm on CT (b) and 4.82 mm on MRI (c). During the follow-up, she developed local tumor recurrence at nasal floor (d, arrow) and multiple pulmonary metastases (e, arrows). Another 66-year-old male was diagnosed with nasal cavity cancer (cT1N0M0) (f, arrow). His baseline TMT was 7.32 mm on CT (g) and 9.43 mm on MRI (h). After surgery, he did not show any progression during the 30 months of follow-up (i).