2010 to January 2020. They were divided into 6 groups according to the gestational age on the day of the ultrasound exam, 28-41days (n = 1), 42-55days (n = 18), 56-69days (n = 32), 70-83days(n = 33), 84-97days(n = 38). We recorded the clinical data (age, gestational age, the serum hCG level before evacuation), and the sonographic features, including uterine volume, embryo sac (transverse diameter, thickness of villi, the internal sac wall), the diameter of yolk sac, embryo (size and heart beat), vesicular sign (size and colour Doppler signal), and lutein ovarian cyst. Results: The mean gestational age of all PHM cases at ultrasound was 78 (range,40-164) days. 137/140 cases (97.9%) presented the embryo sac. We classified into four types: Type 0 (smooth internal wall), Type 1(slightly irregular internal wall), Type 3 (low tension but ellipsoid-shape sac, or one chorionic bump), and Type 4 (non-ellipsoid-shape embryo sac or ≥ 2 Chorionic bumps). The most common of the four types was Type 1 accounting for 51% (70/137), successively Type 2 (26%), Type 0 (14%) and Type 3 (9%). An intact embryo sac with irregular inner wall or chorionic bump provided the important clues to suspect PHM. There was no significant difference in the distribution of four types in the six time-based groups(p > 0.05). Conclusions: This study reveals the US characteristics of PHM, especially in the first trimester. Small morphologic changes in the internal wall of the embryo sac might be valuable for PHM diagnosis.
EP47.05The clinical and ultrasound characteristics of isolated fallopian tube torsion in pregnancy
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