Obstetric Complication Clinical Trial
Official title:
Intra-abdominal Umbilical Vein Aneurysm
The purpose of this study is to investigate the ultrasound characteristics and outcome of pregnancies with fetal Intra-abdominal umbilical vein aneurysm.
Intra-abdominal umbilical vein aneurysm is a rare pathology of the fetal venous system. Its incidence is low, evaluated between 0.4 and 1.1 / 1000. Intra-abdominal umbilical vein aneurysm is identified as an oval or rounded, anechoic mass located between the abdominal wall and the lower edge of the liver. It is defined by two criteria: either 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. The complications that can occur during pregnancy are mainly represented by the MFIU, the occurrence of thrombosis and intrauterine growth retardation (IUGR). Their overall frequency is evaluated at 10%. A complete fetal morphological assessment is necessary to eliminate the presence of other lesions. However, 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 ;
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