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Placenta

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.

Definition
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● 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

Etiology
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● Usually attributed to marginal hemorrhage

Gross description
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● 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
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Double back membranes #1

#2

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


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