Definition of Placental chorioangioma

Placental chorioangioma: A benign vascular (blood vessel) tumor of the placenta. Large chorioangiomas can cause complications, including excess amniotic fluid (polyhydramnios), maternal and fetal clotting problems (coagulopathies), premature delivery, toxemia, fetal heart failure, and hydrops (excess fluid) that affect the fetus.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=9434
Last Editorial Review: 3/19/2012