Ultrasound image of a true umbilical cord knot shows the characteristic "hanging noose" sign: A cross-section view of the cord closely surrounded by a loop of cord.
From: Hasbun J, Alcalde JL, Sepulveda W. Three-dimensional power Doppler sonography in the prenatal diagnosis of a true knot of the umbilical cord: value and limitations. J Ultrasound Med 2007; 26:1215.
http://onlinelibrary.wiley.com/doi/10.7863/jum.2007.26.9.1215/abstract. Copyright © 2007 American Institute of Ultrasound in Medicine. Reproduced with permission of John Wiley & Sons Inc. This image has been provided by or is owned by Wiley. Further permission is needed before it can be downloaded to PowerPoint, printed, shared or emailed. Please contact Wiley's permissions department either via email:
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