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. 2023 Feb 8;15:7. doi: 10.1186/s13089-023-00307-8

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© The Author(s) 2023

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/.

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Fig. 2 — a Sonoanatomy of empty gastric antrum. Antrum appears flat or bull’s eye shaped structure; RA (rectus abdominis), IVC (inferior vena cava). b Sonoanatomy of distended antrum. In early-stage, solids resembles ground glass appearance, the posterior wall of antrum is obscured; RA (rectus abdominis). c Sonoanatomy of distended antrum. In late-stage, solids appear heterogenous and hyperechoic (rectus abdominis). d Distended antrum with clear fluids and gas having/hypoechoic appearance (“starry night”)