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. 2020 Feb 3;380(2):379–392. doi: 10.1007/s00441-020-03172-2

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© The Author(s) 2020

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 — M-Mode imaging across supra- and subpleural spaces over time in LUS. (a) Seashore sign: LUS presents suprapleurally with continuous wave-like lines and a diffuse, sand-like pattern subpleurally, indicating physiologic movement of lung tissue during respiration. (b) Stratosphere sign: lung movement is absent, suggesting the occurrence of a pneumothorax