Placenta

Gross/Macroscopic Variations and Conditions

Fetal Membranes

Circumvallate placenta



Topic Completed: 1 September 2011

Minor changes: 29 October 2021

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PubMed Search: Circumvallate placenta

Mandolin S. Ziadie, M.D.
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Cite this page: Ziadie MS. Circumvallate placenta. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/placentacircumvallate.html. Accessed November 29th, 2021.
Definition / general
  • Insertion of the membranes away from the peripheral edge due to a folding / rolling of the chorion on itself
  • Portion of extrachorial disc is present at the edge
  • Associated with low birth weight and multigravid pregnancies
Etiology
  • Usually attributed to marginal hemorrhage
Gross description
  • Membranes insert away from the peripheral margin
  • Firm ridge at the site of insertion is usually present
  • If cysts and other gross aberrations present, may be associated with fetal and maternal abnormalities
Gross images

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Double back membranes

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