The incidence of placenta previa is 1/200 pregnancies. Most cases of placenta previa will be identified prenatally by prenatal ultrasound. The following is recommended regarding mode and timing of delivery
The nomenclature has been modified and the terms partial and marginal have been eliminated. All placentas which overlie or abut the internal cervical os (to any degree) should be referred to as placenta previa. A placenta which is near to but not overlying the os is termed a low-lying placenta.
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