A 20-year-old obese Thai woman with polycystic ovary syndrome and clinical stage I well-differentiated endometrial carcinoma denied surgical staging. Chest X-ray and magnetic resonance imaging of the whole abdomen suggested neither distance metastasis nor local invasion of the cancer. After 3 months of systemic progestin therapy with megestrol acetate (MA) 480 mg/day, the endometrial carcinoma persisted. The treatment was changed to a combination of levonorgestrel intrauterine system (LNG-IUS) and MA with a stepping-up from 160 to 480 mg/day. Complete remission was achieved at treatment month 9. Prevention of recurrence was provided using LNG-IUS plus MA 160 mg/day. Endometrial surveillance using trimonthly transvaginal ultrasonography and endometrial biopsy suggested no recurrence for at least 24 months after remission.

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