Intra-abdominal Umbilical Vein Aneurysm

Ultrasound monitoring is recommended during the third trimester in search of an increase in dilation and especially the appearance of a thrombus. A particular clinical form, related to abnormal umbilical vein involvement in the infra-hepatic portal system, must be individualized because of a high risk of thrombosis. It justifies the realization of an abdominal ultrasound in the first days of life. This is an aneurysm of the umbilical vein when the umbilical vein has a diameter greater than 9 mm, or a diameter of the subhepatic segment of the umbilical vein greater than 50% of the diameter of its intrahepatic segment.