Placenta
Placental gross / microscopic abnormalities, nonneoplastic
Chorionic cysts

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

Revised: 12 October 2017, last major update October 2011

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PubMed Search: Chorionic cysts placenta

Cite this page: Ziadie, M. Chorionic cysts. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/placentacysts.html. Accessed November 25th, 2017.
Definition / general
  • Fluid filled spaces in the placental membranes, beneath the chorionic plate or within cell islands or septa
  • May be associated with chronic uterine hypoxia (Pediatr Dev Pathol 2011;14:1)
Etiology
  • Thought to be due to ischemia and degeneration
Gross description
  • When visible grossly, cysts are usually small ( < 3 cm) and bulge into the amnionic cavity from the fetal surface
  • Differential diagnosis of grossly visible cysts includes partial moles
Microscopic (histologic) description
  • Spaces filled with eosinophilic proteinaceous material and lined by extravillous trophoblastic cells