This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Pseudo gestational sac is seen in the USG of 
Select and explain. 
A. Missed aboion, B. Ectopic gestation, C. Complete aboion, D. Hematometra
B: Ectopic gestation
Answer: B: Ectopic gestation 
Explanation: Pseudo gestational sac : Irregular in outline Usually, uterus is centrally located No double decidual sign Sac remains empty Seen in ectopic pregnancy Ref: Dutta Obs 9e pg 601.