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True umbilical cord knot Hanging noose sign fetal ultrasound
- focal dilatation of umbilical vein or umbilical vein thrombosis near the umbilical cord knot, giving a false appearance of an umbilical cord cyst
- tortuosity of cord at the level of knot
- a segment of the umbilical cord that is closely surrounded by another loop of umbilical cord is
- considered to be highly specific of a true knot and is known as hanging noose sign
- Hanging noose sign in obstetric imaging is a rarely described but classical finding of a true umbilical cord knot. It demonstrates a transverse section of the umbilical cord surrounded by a loop of umbilical cord and changes in the pressure of the knot can be demonstrated with the fetal movement on a 4D scan.
