Assessment of the number of umbilical cord vessels at the time of nuchal translucency screening - MedCrave online
Velamentous insertion of the umbilical cord - YouTube
Fetal Conversion of a 3‐Vessel to 2‐Vessel Umbilical Cord: Sonographic Depiction - Gerscovich - 2013 - Journal of Ultrasound in Medicine - Wiley Online Library