Velamentous cord insertion
Pronunciation: veh-lah-MEN-tus
Abnormal umbilical cord attachment where vessels insert into fetal membranes rather than directly into placental tissue.
Full Definition
Velamentous cord insertion is a placental abnormality where the umbilical cord vessels separate before reaching the placenta and travel through the fetal membranes (chorioamniotic membranes) without protection from Wharton's jelly. This condition occurs in approximately 1% of singleton pregnancies and up to 15% of multiple pregnancies. The unprotected vessels are vulnerable to compression and rupture, particularly when they cross the internal cervical os (vasa previa). Velamentous insertion increases risks of fetal growth restriction, preterm labor, and emergency cesarean delivery due to fetal hemorrhage.
Usage
Usage note: Do not hyphenate. Often confused with 'marginal insertion' which is less severe. Pronunciation note helpful for verbal communication.
In Context
- "Color Doppler ultrasound revealed velamentous cord insertion with vessels traversing the lower uterine segment." — Ultrasound report
- "Velamentous cord insertion increases the risk of vasa previa and requires careful monitoring throughout pregnancy." — High-risk pregnancy consultation