## **Core Concept**
Vasa previa is a condition where fetal blood vessels, unsupported by either the umbilical cord or placental tissue, traverse the cervix below the presenting part of the fetus. This condition poses a significant risk of fetal hemorrhage and death if these vessels rupture during labor or membrane rupture.

## **Why the Correct Answer is Right**
The correct statement about vasa previa involves its definition and clinical implications. Vasa previa is characterized by the presence of fetal vessels in the membranes covering the internal cervical os. These vessels are at high risk of rupture, leading to fetal exsanguination. The condition requires careful prenatal diagnosis, usually via ultrasound, and often necessitates delivery by cesarean section to prevent vessel rupture.

## **Why Each Wrong Option is Incorrect**
- **Option A:** [Insert option A text here] - This option is incorrect because [provide a brief explanation for why option A is wrong].
- **Option B:** [Insert option B text here] - This option is incorrect because [provide a brief explanation for why option B is wrong].
- **Option C:** [Insert option C text here] - This option might seem plausible but is incorrect due to [specific reason for its incorrectness].

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl regarding vasa previa is that it is associated with a high risk of fetal mortality if the vessels rupture. The condition can often be diagnosed prenatally with ultrasound, specifically with the use of Doppler studies. Pregnancies complicated by vasa previa typically require close monitoring and planned delivery, often by cesarean section, before the onset of labor or rupture of membranes.

## **Correct Answer:** D.