Placenta
Gross / macroscopic variations and conditions
Fetal membranes
Circumvallate placenta
Author: Mandolin S. Ziadie, M.D.
Last author update: 1 September 2011
Last staff update: 29 October 2021
Copyright: 2002-2023, PathologyOutlines.com, Inc.
PubMed Search: Circumvallate placenta
Cite this page: Ziadie MS. Circumvallate placenta. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/placentacircumvallate.html. Accessed June 9th, 2023.
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
