Cesarean scar diverticula (CSD) is a novel recognized cause of postmenstrual abnormal uterine bleeding in women. No clinical guidelines have been issued for the management of CSD. The investigators have previously demonstrated that vaginal repair of CSD was an relative effective treatment of CSD. However, only 28.2% of the CSD patients normalized to less than 7 days of menstruation, whereas 51.2% of women had 7 to 10 days of menstruation at 6 months post vaginal repair. Postoperative menstruation may contribute to surgical site infections, which may subsequently affect the healing of uterine scars. Treatment CSD patients with gonadotropin-releasing hormone agonist (GnRHa) may has the potential to improve therapeutic effects of vaginal repair. Therefore, the current multiple-center randomized controlled trial was designed to evaluate whether the application of GnRHa in combination with vaginal repair could achieve better clinical effects than those achieved by vaginal CSD repair alone.

Postoperative menstruation may contribute to surgical site infections, an inflammatory environment, congestion at the site of the suture, immune cell infiltration, and other effects and may subsequently affect the healing of uterine scars. It is reasonable to hypothesize that delaying the postoperative menstrual recovery period may allow uterine scars to heal without the inflammatory reaction caused by menstruation. Treatment with gonadotropin-releasing hormone agonist (GnRHa) has the ability to suppress follicle-stimulating hormone (FSH) and luteinizing hormone (LH) release, thereby maintaining low estrogen levels and causing temporary amenorrhea. A prolonged menstrual recovery period may be achieved after GnRHa administration. Vaginal repair of CSD combined with GnRHa may improve the therapeutic effects of treatment of CSD. Therefore, the randomized study was designed to evaluate whether the application of GnRHa in combination with vaginal repair could achieve better clinical effects than those achieved by vaginal CSD repair alone.

Inclusion Criteria:

1. Patients are younger than 40.
2. Clearly diagnosed with CSD.
3. Experiencing clinical features of abnormal uterine bleeding, prolonged menstrual flow (the duration of menstruation is more than 7 days).
4. The thickness of the remaining muscular layer of CSD was less than 3 mm.
5. The women are at least 20 years old with singleton pregnancies and had undergone a cesarean delivery after at least 37 weeks of gestation.
6. The medicine conservative treatment is invalid.
7. Refusing or use birth control pills contraindications.
8. No serious medical problems (important viscera function in the normal range).
9. No uterine fibroids, endometriosis, adenomyosis, and patients with ovarian cysts.
10. No gynaecology or other malignant tumors.
11. Sign the informed consent.

Exclusion Criteria:

1. Over the age of 40;
2. Indefinite diagnosis.
3. The absence of clinical manifestations of CSD.
4. The presence of menstrual irregularities before cesarean delivery.
5. Coagulation disorders.
6. Malignant tumors.
7. With severe medical problems (severe liver disease, kidney disease, respiratory diseases, heart disease or uncontrolled diabetes, epilepsy, etc., dysfunction of important organs).
8. Known chronic inflammatory diseases, any other uterine diseases (such as uterine fibroids, endometriosis and adenomyosis), uterine surgery except cesarean section.
9. Use of intrauterine devices.
10. Unwilling to comply with the research plan.