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. 2021 Jul 30;32(2):1078–1086. doi: 10.1007/s00330-021-08200-5

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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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Fig. 2 — Different types of RPE in axial fat-suppressed T2-weighted Dixon images (first row), axial pre-contrast T1-weighted images (second row), axial post-contrast in-phase Dixon T1-weighted images (third row), and axial ADC maps (fourth row), from three patients (a–c). a A 63-year-old male with tonsillitis had high T2 signal, contrast enhancement on T1, and no purulence on ADC (enhancement-type RPE). b A 23-year-old female with parotitis had high T2-signal, non-enhancing fluid on T1, and no purulence on ADC (fluid-type RPE). c A 41-year-old female with a throat infection had an intermediate T2-signal, non-enhancing fluid on T1, and low ADC consistent with purulent fluid (true retropharyngeal abscess)