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. 2023 Sep 1;23:80. doi: 10.1186/s40644-023-00602-6

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© The Author(s) 2023

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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 8 — A 47-year-old male patient with nasopharyngeal carcinoma presented with residual lesions after chemoradiotherapy. T2WI sequence (A), T1WI contrast enhancement sequence (B), rFOV DWI sequence (C), and ADC map (D) showed the location of huge tumors in the right nasopharynx. MTR (7.0ppm) color maps (E) and APTw-SI:MTR_asym (3.5ppm) color maps (F) showed that the tumor is of equal or high signal and of slightly low signal, respectively. Based on B0 map (G), tumor ROI showed homogenous and reasonable phase difference (< 60 Hz) compared to nasal cavity. MRI examination at the end of induction chemotherapy showed that the tumor had regression significantly (H, I). MRI examinations and electronic nasopharyngoscopy at the end of chemoradiotherapy showed that the tumor had small residual lesions (partial response, PR) (yellow arrow) and was classified into the residual group (J, K). MRI examinations at 6 months (L, M) after the last chemoradiotherapy treatment showed the tumor had completely disappeared and it verifies the previous judgment. Hematoxylin-eosin staining of pathological biopsy showed differentiated nonkeratinizing nasopharyngeal carcinoma (N)