Placental gross / microscopic abnormalities, nonneoplastic
Accessory (succenturiate) lobe

Topic Completed: 1 September 2011

Revised: 15 February 2019

Copyright: 2002-2019,, Inc.

PubMed Search: Placenta accessory lobe OR succenturiate lobe

Mandolin S. Ziadie, M.D.
Page views in 2018: 911
Page views in 2019 to date: 909
Cite this page: Ziadie MS. Accessory (succenturiate) lobe. website. Accessed November 21st, 2019.
Definition / general
  • 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
  • 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
Gross images

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Accessory lobe

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