Placental gross / microscopic abnormalities, nonneoplastic

Topic Completed: 1 October 2011

Minor changes: 18 February 2019

Copyright: 2002-2019,, Inc.

PubMed Search: "Placental polyp"

Mandolin S. Ziadie, M.D.
Page views in 2019: 837
Page views in 2020 to date: 334
Cite this page: Ziadie MS. Polyps. website. Accessed June 1st, 2020.
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
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