Just like every pregnancy is different, there are different types of placenta previa, as well. Characterization of these types depends on how much the placement of the placenta interferes with the cervical opening. In complete previa, the placenta covers the entire cervical opening. Partial previa describes when only part of the cervical opening is covered by the placenta. In the third type, marginal previa, the placenta does not cover, but lies near, the opening of the cervix. The degree to which the placenta blocks the opening to the birth canal is important for determining treatment.
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