Cite this page: Ziadie, M. Supernumerary vessels. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/placentasupernumerary.html. Accessed November 21st, 2018.
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