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: Hemorrhage[title] placental[title]

Cite this page: Ziadie, M. Hemorrhage. website. Accessed November 18th, 2018.
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