Placental gross / microscopic abnormalities, nonneoplastic

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

Revised: 13 October 2017, last major update October 2011

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

PubMed Search: "Placental polyp"

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Cite this page: Ziadie, M. Polyps. website. Accessed January 19th, 2019.
Definition / general
Microscopic (histologic) description
  • Uterine placental polyps are composed of necrotic and hyalinized chorionic villi without identifiable lining trophoblast; intermediate trophoblast is usually viable; base of polyp is composed of decidua with dilated blood vessels
  • Amniotic polyps are composed of thin connective tissue stalks lined by amniotic degenerating epithelium