Transvaginal sonography is the most useful diagnostic method to visualize the early pregnancy, to determine whether it is intrauterine or extrauterine (ectopic), viable or not. Detailed examination of extraembryonic structures allows us to differentiate the types of early pregnancy failures and highlights the backgrounds of vaginal bleeding, as the most frequent symptom of the first trimester of gestation. The reliable ultrasonographic sign of an intrauterine pregnancy is visualization of double decidual ring, which represents the trophoblast’s layer. The abnormality in the sonographic appearance of a gestational sac, a yolk sac, and a chorionic plate can predict subsequent embryonic damage and death.
Keywords: Blighted ovum, Chorionic plate, Extraembryonic structures, Gestational sac, Missed abortion, Subchorionic hemorrhage, Yolk sac.
How to cite this article: Nagy S, Papp Z. Ultrasound Imaging of Early Extraembryonic Structures. Donald School J Ultrasound Obstet Gynecol 2017;11(1):11-19.
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Conflict of interest: None