Placental gross / microscopic abnormalities, nonneoplastic

Topic Completed: 1 October 2011

Minor changes: 18 February 2019

Copyright: 2002-2019,, Inc.

PubMed Search: Hemorrhage[title] placental[title]

Mandolin S. Ziadie, M.D.
Page views in 2019: 1,389
Page views in 2020 to date: 674
Cite this page: Ziadie MS. Hemorrhage. website. Accessed May 30th, 2020.
Definition / general
  • Bleeding between the placental floor and the uterine wall or between the placental parenchyma and membranes
  • May be associated with vaginal bleeding, oligohydramnios and premature delivery
  • Marginal hemorrhages are related to maternal age, parity and smoking
  • Associated with marginal cord insertion, velamentous vessels and implantation in the lower uterine segment
Gross description
  • Chronic hemorrhage can result in marginal hematoma formation with circumvallate membranes
Microscopic (histologic) description
  • Chorioamnionic hemosiderosis may be present
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