الفهرس 
Placenta & Placental abnormalities
Epidemiology of placenta accretaOnly 14 pages are availabe for public view
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Abstract
The term morbidly adherent placenta implies an abnormal placental implantation into the uterine wall and has been used to describe placenta accreta,increta,and percreta. It invades the uterine myometrium due to defect in the collagen fibers associated with previous uterine surgery. Its grades differ
according to the degree of the trophoblastic invasion through the myometrium and bladder serosa.Incidence of placenta accreta is increased over the past 50 years mainly due to increasing rates of cesarean delivery. The incidence was cited as 1 in
2500 in the 1980s, and currently, the American College of Obstetricians and
Gynecologists (2012) cites it to be as high as 1 in 533 deliveries.The exact etiology of placenta accreta is unknown, but there are several risk factors. It includes placenta previa, increasing rates of cesarean delivery
which is a special factor and previous uterine surgery. These previous uterine
surgery include myomectomy, hysterotomy, uterine curettage an
hysteroscopic procedures as septal resection, endometrial polyp resection and submucous leiyomyoma resection. All these surgery associated with
myometrial tissue damage followed by a secondary collagen repair.