单脐动脉又称脐带双血管,是较少见的脐带血管数目异常。有研究表明单脐动脉可合并多种胎儿畸形,发生率达10%~50%,为正常胎儿的7倍,并且还与胎儿宫内发育迟缓,早产、双胎,染色体异常等因素有关,病死率高〔1〕。近年来随着超声医学影像技术的迅速发展,产前诊断单脐动脉已成为可能 Single umbilical artery, also known as umbilical cord blood vessels, is a rare number of abnormal umbilical cord blood vessels. Studies have shown that single umbilical artery can be combined with a variety of fetal malformations, the incidence rate of 10% to 50%, seven times the normal fetus, but also with intrauterine growth retardation, premature birth, twins, chromosomal abnormalities and other factors related to death High rate 〔1〕. In recent years, with the rapid development of ultrasound medical imaging technology, prenatal diagnosis of single umbilical artery has become possible