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Placental gross/microscopic abnormalities, non-neoplastic

Circumvallate placenta

Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 10 October 2011, last major update September 2011
Copyright: (c) 2003-2011, PathologyOutlines.com, Inc.


● Insertion of the membranes away from the peripheral edge due to a folding / rolling of the chorion on itself
● A portion of extrachorial disc is present at the edge
● Associated with low birth weight and multigravid pregnancies


● Usually attributed to marginal hemorrhage

Gross description

● The membranes insert away from the peripheral margin
● A 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

Double back membranes #1


End of Placenta > Placental gross/microscopic abnormalities, non-neoplastic > Circumvallate placenta

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