There are a few predisposing factors for placenta previa. They include advanced maternal age, increased parity, uterine abnormalities, multiple gestation, tobacco abuse, prior placenta previa, and previous uterine surgery.
Figure 21-5 Various types of placenta previa. A, Cervical os is completely covered by the placenta. B, Cervical os is partially covered by the placenta. C, Placenta extends to the edge of the cervical os.
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