MCQ 8

A 25 year old woman presents with vaginal spotting and right lower quadrant abdominal pain.There is minimal dark blood in the vaginal vault,and her cervix is closed and thick.Quantitative serum hCG is 4000 mIU/ml. A transvaginal ultrasound (TVUS) shows no evidence of pregnancy inside the uterus. What is the most likely diagnosis?
a. Hydatidiform mole
b. Ectopic pregnancy
c. Appendicitis
d. Endometriosis
Answer and explanation