Vasa previa is associated with all of the following EXCEPT:
- A Bilobed placenta
- B Marginal cord insertion with posterior placenta ✓
- C Succenturiate lobe
- D Velamentous cord insertion
Correct answer: B. Marginal cord insertion with posterior placenta
Explanation
Vasa previa occurs when fetal blood vessels traverse the internal os unsupported by placental tissue or umbilical cord, placing them at risk of rupture during membrane rupture. It is strongly associated with velamentous cord insertion (where cord vessels run within membranes before reaching the placenta), bilobed placenta, and succenturiate lobe placenta (where vessels connecting the accessory lobe may cross the os). Marginal cord insertion with a posterior placenta is not a recognised association of vasa previa.
Reference: Williams Obstetrics, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.