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

Author: Mandolin Ziadie, M.D. (see Authors page)

Revised: 12 October 2017, last major update September 2011

Copyright: (c) 2002-2017,, Inc.

PubMed Search: Placenta accessory lobe OR succenturiate lobe

Cite this page: Ziadie, M. Accessory (succenturiate) lobe. website. Accessed November 15th, 2018.
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