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. 2024 Nov 28;24:801. doi: 10.1186/s12884-024-06962-6

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 2 — Various ultrasound Doppler techniques demonstrate umbilical cord entanglement. A. 2D power Doppler shows the entangled cord point. B. 3D multiplanar power Doppler ultrasound displays the connection between the entangled point of the fetal umbilical cords and the two fetal hearts and circulations. C. 3D HD power Doppler flow highlights the bidirectional flow of the two entangled cords and the different fetal circulations. D. 3D HD-live power Doppler flow depicts the entanglement of two separate umbilical cords