Women who have had a cesarean section generally need to monitor the thickness of the myometrium of the anterior wall of the lower segment of the uterus after another pregnancy. This is because the thickness of the myometrium represents the thickness of the scar, which can increase the risk of uterine rupture if the scar is too thin. Normally, the thickness of the myometrium of the lower wall of the uterus should be greater than 3 mm or more, and it is also important to see if the uterine incision is continuous there are no dark areas or diverticula at the site of the incision. If the thickness of the incision is greater than 3mm during pregnancy, the risk of uterine rupture is relatively low. If the thickness is particularly thin or the continuity of the incision is not good, the risk of uterine rupture increases and the pregnancy needs to be terminated promptly.