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Placenta

Placental gross/microscopic abnormalities, non-neoplastic

Accessory (Succenturiate) Lobe


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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● One or multiple accessory lobes connected to the main disc by blood vessels that are at risk for hemorrhage and thromboemboli
● Seen in 3% of placentas

Etiology
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● Due to focal non-involution of chorionic laevae

Gross description
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● Main placental disc is attached to a smaller portion of placenta by fetal vessels and membranes

Gross images
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Accessory lobe

End of Placenta > Placental gross/microscopic abnormalities, non-neoplastic > Accessory (Succenturiate) Lobe


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