What is the classification of placenta previa characterized by the placenta being attached in the lower uterine segment but not covering the cervical os?

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

Answer: (B)

The classification of placenta previa where the placenta is attached in the lower uterine segment but does not cover the cervical os is indeed known as marginal previa. In this scenario, the edge of the placenta is at the cervix but does not extend over it, allowing for normal delivery to be possible with appropriate monitoring and medical management.

Marginal previa can often go unnoticed until later stages of pregnancy during routine ultrasounds, and, unlike complete or partial previa, does not pose an immediate risk of obstructing the birth canal. This differentiation is crucial in managing pregnancy and delivery options safely.

Understanding these classifications helps in the assessment of potential complications during labor and delivery, guiding the healthcare provider's decisions and ensuring better outcomes for both the mother and the baby.