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. 2024 Mar 25;15:86. doi: 10.1186/s13244-024-01648-1

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© The Author(s) 2024

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. 1 — Enhancement patterns of the SLNs on contrast-enhanced lymphatic US. From left to right: the enhanced US image; the grayscale US image at the dual display; and the schematic illustration of enhanced and grayscale US images. A Pattern I, homogeneous enhancement. The echogenic contrast agent is evenly distributed within the SLN with a thin hypoechoic cortex (arrows) on the grayscale US. B Pattern II, inhomogeneous enhancement. The uneven distribution of the contrast agent with two filling defect areas (*) of the SLN is seen correlating to the focal eccentric cortical thickening (arrows) on grayscale US. C Pattern III, no enhancement. There is an enhanced lymphatic vessel (arrowhead), but no contrast agent accumulation is visible inside the SLN. The SLN shows focal eccentric cortical thickening on grayscale US (arrows). SLN sentinel lymph node