Placenta
Umbilical cord
Velamentous insertion


Topic Completed: 1 November 2011

Revised: 20 February 2019

Copyright: 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Velamentous insertion[title] umbilical cord

Mandolin S. Ziadie, M.D.
Page views in 2018: 753
Page views in 2019 to date: 652
Cite this page: Ziadie MS. Velamentous insertion. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/placentavelamentous.html. Accessed September 17th, 2019.
Definition / general
  • Insertion of umbilical cord into extraplacental membranes, with intramembranous portions of vessels exposed to possible trauma / rupture
  • Occurs in 1% of placentas
  • Associated with twin gestations, congenital malformations, maternal smoking and single umbilical arteries
  • Poses a risk for vascular compression, trauma and thrombosis with associated risks of fetal morbidity and mortality
Gross images

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Velamentous insertion of umbilical cord

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