Radiofrequency ablation (RFA) has been proposed as an alternative to hysterectomy for treatment of uterine fibroids and adenomyosis. Until now, there have been no prospective studies published investigating fertility and pregnancy outcomes after RFA of myomas. A 31-weeks pregnant woman who had undergone laparoscopic RFA about 3 years ago was admitted to our hospital with abdominal pain. During conservative treatment, the patient complained of very painful abdominal gas and recurrent variable deceleration was observed without uterine contractions in the cardiotocography. An emergency cesarean was performed, and placenta percreta with active bleeding on the posterior wall of the uterus was found, along with multiple placental percreta lesions. She was discharged from the hospital on the seventh day after conservative surgery with a good overall condition. To our knowledge, this is the first case of placenta percreta after RFA for adenomyosis.