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. 2020 Oct 12;21:430. doi: 10.1186/s12882-020-02084-1

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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. 2 — a Right kidney showing inversion of the normal cortico-medullary echogenicity pattern: in this patient with nephrocalcinosis, the pyramids and medulla are strikingly hyperechogenic, because of the deposition of crystals (Philips iU 22, multifrequency convex probe C5–1); b B-mode image of the right kidney, obtained with a 12.5 MHz linear probe. Cysts of the inner medulla are better recognized (Esaote MyLab Seven, 12.5 MHz linear probe)