This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetus Placenta & Fetal Membrane, Subject name: Gynaecology & Obstetrics
Fetal blood loss in abnormal cord insertion is seen in: 
Select and explain. 
A. Vasa previa, B. Decidua basalis, C. Battledore placenta, D. Succenturiate placenta
A: Vasa previa
Answer: A: Vasa previa 
Explanation: Ans. A. Vasa previa* Vasa previa is an uncommon condition in which fetal blood vessels traverse the lower uterine segment in advance of the presenting Part.* Neither the umbilical cord nor the placenta supports the vessels.* Vasa previa presents with painless vaginal bleeding at the time of spontaneous rupture of membranes or amniotomy (AROM).* Fetal shock or demise can occur rapidly.* Fetal mortality for cases not recognized before the onset of labor is reported to range between 22.5% and 100