Objective: To investigate the effects of levonorgestrel-releasing intrauterine system (LNG-IUS) for symptomatic adenomyosis.

Methods: From December, 2006 to December, 2014, symptomatic patients of adenomyosis diagnosed (with dysmenorrhea and/or menorrhea) by transvaginal ultrasound in outpatient or inpatient clinics of Peking Union Medical College Hospital were given the treatment of LNG-IUS. Before and after placement of LNG-IUS, during each following period, all the parameters were recorded prospectively, including carrying status of IUS, symptoms and scores of dysmenorrhea, menstruation scores, biochemical indicators, physical parameters, menstruation patterns and adverse effects.

Primary outcome measures: symptoms and scores of dysmenorrhea and menorrhea

Second outcome measures: carrying status of IUS

Inclusion Criteria:

• Women with regular menses
• Adenomyosis diagnosed via transvaginal ultrasound
• With severe dysmenorrhea (VAS ≥ 7) and/or menorrhea (pictorial chart scores >100)
• Duration of placement > 12 months
• Size of uterus by physical examination less than uterus of 12-week pregnancy

Exclusion Criteria:

• Desire for pregnancy or lactation
• With diagnosis of malignancies or precancerous lesions
• Acceptance of laparotomy
• Contraindication of placing levonorgestrel-releasing intrauterine system

IPD will be shared with researchers via online database