Placenta
Gross / macroscopic variations and conditions
Variations in size and shape
Accessory lobe / bilobate placenta
Author: Mandolin S. Ziadie, M.D.
Last author update: 1 September 2011
Last staff update: 23 February 2021
Copyright: 2002-2024, PathologyOutlines.com, Inc.
PubMed Search: Placenta accessory lobe OR succenturiate lobe
Cite this page: Ziadie MS. Accessory lobe / bilobate placenta. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/placentaaccessory.html. Accessed April 19th, 2024.
Accessory lobe
- 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
- Also called succenturiate lobe
- Due to focal noninvolution of chorionic laevae
- Gross description: main placental disc is attached to a smaller portion of placenta by fetal vessels and membranes
Bilobate placenta
- Two lobes of equal size, separated by fetal membranes or connected by narrow isthmus of placental tissue
- Umbilical cord inserts in the membranes between the two discs and is at risk for rupture
- If incompletely removed, there is a risk of maternal postpartum hemorrhage
- Gross description: two lobes of equal size separated by membranes
Gross images
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Accessory lobe
