True or false umbilical cord knot? Differentiation via 3D/4D color Doppler ultrasound.

@article{Merz2018TrueOF,
  title={True or false umbilical cord knot? Differentiation via 3D/4D color Doppler ultrasound.},
  author={Eberhard Merz and Sonila Pashaj},
  journal={Ultraschall in der Medizin},
  year={2018},
  volume={39 2},
  pages={
          127-128
        }
}
True umbilical cord knots are actual knots in the umbilical cord formed during pregnancy, while a false umbilical cord knot is a bulge in the umbilical cord due to twisting of the vein around the arteries or around an overlap of umbilical cord loops lying against one another. True umbilical cord knots are relatively rare. Based on births, an incidence of 0.3 – 1.2 % is specified [1, 2]. Various factors are associated with the occurrence of an umbilical cord knot: grandmultiparity, chronic… 

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TLDR
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