MSFinals-3276
A 28-year-old woman presents at 12 weeks’ gestation for her dating scan. The radiographer calls you in to speak to the patient, as the gestational sac is small for dates and she is unable to demonstrate a fetal heart rate. On further questioning, the patient reports an episode of bleeding while abroad at nine weeks’ gestation, which settled spontaneously.
Which of the following is the most likely diagnosis?