A placenta previa in which the placental edge just reaches the internal os is more commonly known as:

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A placenta previa that does not cover any part of the cervix is termed marginal.With a total placenta previa,the placenta completely covers the os.When the patient experiences a partial placenta previa,the lower border of the placenta is within 3 cm of the internal cervical os but does not completely cover the os.A complete placenta previa is termed total.The placenta completely covers the internal cervical os.

A Placenta Previa in Which the Placental Edge Just Reaches