Placenta previa, the implantation of the placenta at least partially covering the cervix, occurs in about one in 200 pregnancies. There are actually three types of previa.
Complete previa where the cervical os, the mouth of the uterus, is completely covered. Partial previa where just a portion of the cervix is covered by the placenta. And the marginal previa that extends just to the edge of the cervix.
Risks for the mother include:
- Life-threatening hemorrhage
- Cesarean delivery
- Increased risk of postpartum hemorrhage
- Increased risk placenta accreta (Placenta accreta is where the placenta attaches directly to the uterine muscle.)
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