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Definition of Placenta percreta

Placenta percreta: A condition in which the placenta invades the uterine wall. In placenta percreta, the vascular processes of the chorion (chorionic villi), a fetal membrane that enters into the formation of the placenta, can invade the full thickness of the myometrium. This can cause an incomplete rupture of the uterus. The chorionic villi can go right on through both the myometrium and the outside covering of the uterus (serosa), causing complete and catastrophic rupture of the uterus.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4921
Last Editorial Review: 3/19/2012

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