Abstract
Introduction: In early embryo development, there are 4 umbilical vessels. Then the right vein regresses and the cord contains two arteries and the left vein. A single umbilical artery (SUA) is the most common defect. It may be accompanied by other malformations and intrauterine growth retardation (IUGR). The anomalies of the umbilical vessels may also involve abnormal insertion, course, and additional vessels. In Persistent Right Umbilical Vein (PRUV) the left vein regresses and the right persists open.
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