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True umbilical cord knot
- 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
