This is a report of an unintended application of MR-HIFU therapy of uterine fibroids (UFs) in a woman in early pregnancy and should be treated as the first description of such an event. A 37-year-old nullipara with confirmed UFs, who suffered from excessive uterine bleeding and dysmenorrhea, was qualified for MR-HIFU therapy to reduce UF-related symptoms. The procedure took place 2 months later. No complications occurred and the patient was discharged home in good overall condition. About 5 weeks after the procedure the patient was diagnosed with viable intrauterine pregnancy. Basing on early pregnancy ultrasound it was calculated that at the time of MR-HIFU procedure the patient was about 10 (+/- 3 days) days after the conception. Later, the pregnancy was uncomplicated and she gave birth to a healthy neonate. Physical examinations did not reveal any abnormalities in her child. Symptoms associated with UFs significantly decreased after the therapy and pregnancy. Despite the fact that the pregnancy being subjected to MR-HIFU treatment had further uncomplicated course, the presented case indicates that counseling/management in women at reproductive age should be standardized to avoid unknown consequences of such unrecommended procedures for the fetus. According to current standards MR-HIFU procedures to treat UFs should never be performed without a negative pregnancy test.
Keywords: Uterine fibroid; complication; leiomyoma; magnetic resonance guided focused ultrasound (MRgFUS); magnetic resonance guided high-intensity focused ultrasound (MR-HIFU); pregnancy.