This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
All are signs / features of ectopic pregnancy on USG except – 
Select and explain. 
A. Pseudo sac, B. Hyperechoic rim, C. Adenexal mass, D. Echogenic mass with multicystic spaces within endometrial cavity
D: Echogenic mass with multicystic spaces within endometrial cavity
Answer: D: Echogenic mass with multicystic spaces within endometrial cavity 
Explanation: Echogenic mass with multicystic spaces within the endometrial cavity is seen in gestational trophoblastic diseases, e.g. Hydatifonn male.
Pseudosac, Adenexal mass and Doughnut sign are seen in ectopic pregnancy.
An ectopic pregnancy classically has a thick hyperechoic rim with a central hypoechoic region.