Clinical Evaluation of Detecting Yolk Sac by Ultrasonography During Early Pregnancy

ObjectiveTo monitor the morphology and size of yolk sac by ultrasonography during early pregnancy and evaluate the correlation between abnormal yolk sac and pregnancy. Methods The morphology and size of yolk sacs in 152 pregnant women were detected by vaginal and abdominal ultrasonography, follow-up was continued till their delivery. Results Of the group, there were 128 cases of normal pregnancy, 22 cases of embryo death and 2 cases of fetal malformation. The size of yolk sacs in normal pregnancy became bigger as the gestation proceeded from the fifth to the tenth week, then changed to smaller until they disappeared after the twelfth week of gestation. Significant difference existed between the size of yolk sacs in normal and abnormal pregnancy group (P≤ 0.001 ). Poor prognosis was observed in pregnancies with abnormal yolk sacs. Conclusion The health status examination of yolk sacs by ultrasonography during early pregnancy can be used as a measure to predict the development and alteration of pregnancy. [