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placenta previa Signs and Symptoms
The cardinal symptom of placenta previa is painless vaginal
TABLE 31.10 Differential Diagnosis of Third-Trimester Bleeding Signs and Symptoms predisposing Conditions placenta previa painless vaginal bleeding Advanced age Multiple parity
Placenta previa occurs in up to 1% of full-term pregnancies.
Placenta previa is classified as complete when the entire cervical os is covered by placental tis- sue, partial when the internal os is covered by placental tissue when closed but not when fully dilated, and marginal when placental tissue encroaches on or extends to the margin of the internal cervical os.
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