Umbilical Cord

Sonographic examination of the umbilical cord should reveal two arteries and a single larger vein ( Fig 109-18). A cord that contains only one artery is associated with a 25 to 50 percent chance of fetal abnormalities. The cord vessels are best counted at the cord insertion into the fetus, since the two umbilical arteries may normally fuse at the placental end of the cord.

FIG. 109-18. Umbilical cord. Three loops of cord are seen in this image. An umbilical vein and two smaller arteries are seen in each loop of umbilical cord.

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