Cite this page: Ziadie MS. Supernumerary vessels. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/placentasupernumerary.html. Accessed July 18th, 2019.
Definition / general
- Four or more umbilical cord vessels due to an extra artery or vein
- May be associated with fetal anomalies and maternal smoking
- Thought to originate from persistent umbilical veins or vitelline vessels
- Looping may cause artifactual supernumerary vessels and should be excluded on gross examination