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Placenta

Umbilical cord

Velamentous insertion

Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 29 November 2011, last major update November 2011
Copyright: (c) 2003-2011, PathologyOutlines.com, Inc.

Definition
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● 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

End of Placenta > Umbilical cord > Velamentous insertion

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