During a cesarean section, after the abdominal cavity is opened, a transverse incision is usually made in the lower part of the uterus, and after the baby and placenta are removed, the uterine wound is finally repaired. Usually, this location is weaker than the other parts of the uterus, and some patients may find that the local myometrium is thinner than normal or even appears as a depression on postoperative ultrasound. Diagnosis can usually be made by ultrasound or, if necessary, by MRI. Hysteroscopy can reveal a depression in the uterus. When combined with a history of cesarean delivery and menstrual dripping, the diagnosis can basically be established. Usually, if there are no symptoms and no intention to have children, such diverticula do not require any treatment and regular check-ups are sufficient. If there are symptoms of menstrual dribbling, which have some impact on life, surgery can be considered to repair the diverticulum. The surgery can be done laparoscopically, hysteroscopically, transvaginally or open. Regardless of the route, potential bladder injury during surgery is a surgical complication because of adhesions between the bladder and the lower uterine segment after cesarean delivery. A question worth exploring is if the patient is planning to have further children and if they are asymptomatic, whether they need surgical management, and there are no results comparing the different options. There is a classification in the literature according to the thickness of the uterus at the site of the uterine scar, with <2mm being severe, 2-5mm being moderate, and 5mm or more being mild. At present, there is no good clinical RCT evidence on what needs to be repaired before another pregnancy. My current personal opinion is that if the thickness of the uterine incision site is less than 2mm, it is a severe diverticulum, which is recommended to be treated before pregnancy. Of course, even if there is no diverticulum, there is still a chance of uterine rupture, and it is crucial that if the rupture is found, surgery is performed in a timely manner.