Objective To discuss the value of ultrasonography in diagnosing uterine scar defect during the period of pregnancy after cesarean operation so as to take necessary treatment timely to ensure the maternal and fetal safety. Methods Ultrasonography was used to check the pregnant women in their second or third trimester of re-pregnancy after cesarean operation, and 82 women were diagnosed as uterine scar defect. Among them 49 cases had thin myometrium(< 1.0 mm), and 33 cases had local myometrium deletion. Cesar...