Many factors can increase the risk of placenta accreta, including:

  • Previous uterine surgery. If you've had a C-section or other uterine surgery, you're at increased risk of placenta accreta. The risk of placenta accreta increases with the number of uterine surgeries.
  • Placenta position. If your placenta partially or totally covers your cervix (placenta previa) or sits in the lower portion of your uterus, you're at increased risk of placenta accreta.
  • Maternal age. Placenta accreta is more common in women older than 35.
  • Previous childbirth. The risk of placenta accreta increases each time you give birth.
  • Uterine conditions. The risk of placenta accreta is higher if you have abnormalities or scarring in the tissue that lines your uterus (endometrium). Noncancerous uterine growths that bulge into the uterine cavity (submucosal uterine fibroids) also increase the risk.
May. 24, 2012