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. 2020 Apr 19;20:40. doi: 10.1186/s12880-020-00438-7

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© The Author(s) 2020

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/. 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. 1 — A 51-year-old male with primary cholesteatoma in the right middle ear confirmed by right mastoidectomy. Axial T1WI (a) and T2WI (b) showed the anatomical location of the cholesteatoma (arrow) in the right middle ear. c, e: TGSE BLADE (b1000) and RESOLVE (b1000) DWI showed a restricted diffusion lesion (high signal) in the right mastoid bone. d, f: The ADC on TGSE BLADE and RESOLVE DWI was 0.689 × 10^− 3 mm²/s and 0.791 × 10^− 3 mm²/s, respectively. However, the cholesteatoma lesion (arrow) was not as clear on RESOLVE DWI as on TGSE DWI. Moreover, the structures of the nasal cavity were obviously distorted on the RESOLVE b1000 (e) and ADC (f) maps, whereas almost no distortion was observed on the TGSE b1000 and ADC maps. Images (c and e) show the geometric deformation values of the entire image for images with a score of 4 (no distortion) and 2 (moderate distortion)