What classification of placenta previa indicates the cervical os is only partially covered by the placental attachment?

• A. Marginal previa
• B. Complete previa
• C. Low-lying previa
• D. Incomplete or partial previa

Answer: (D)

The classification of placenta previa that indicates the cervical os is only partially covered by the placental attachment is referred to as incomplete or partial previa. This condition means that while some portion of the placenta lies over the cervix, it does not completely cover it. This situation can have significant implications for labor and delivery, as it can lead to complications if the placenta obstructs the birth canal during a vaginal delivery.

In assessing the various types of placenta previa, it's essential to understand that each classification carries specific characteristics. Marginal previa occurs when the edge of the placenta is at the margin of the cervical os but does not cover it, while complete previa indicates that the entire cervical opening is covered by the placenta. Low-lying previa refers to a scenario where the placenta is positioned in the lower uterine segment but is not covering the os. Hence, the term “incomplete or partial previa” accurately describes the situation where the cervical os is only partially obscured by the placenta, aligning with the requirements for this classification.