Myoma migration: an unexpected "effect" with Ulipristal acetate treatment.

OBJECTIVE: Uterine myomas are one of the most common benign tumours, occurring in 20-40% of women of reproductive age. Ulipristal acetate (UPA) is a possible option for medical treatment of myomas. It induces amenorrhea and can reduce myoma volume before surgical treatment. Since its introduction in our department, we uncovered an unknown effect: migration of myoma. CLINICAL CASE REPORTS: We describe three clinical case of myoma migration following three months UPA pre-operative treatment. The first woman presented with a FIGO 2 myoma, which migrated in FIGO 3. A previously planned hysteroscopy converted into a laparoscopy. The second woman also presented with a FIGO 2 myoma, which migrated in FIGO 3. Initially, a hysteroscopy was planned, but ultimately surgery was no longer required. The third woman presented with a FIGO 2-5 myoma, which migrated in FIGO 1. The previously planned laparoscopy converted into a vaginal myomectomy. CONCLUSIONS: UPA induces a proapoptotic and anti proliferative effect of leiomyoma cells. It reduces expression of VEGF and reduces collagen deposition in the extracellular matrix. These mechanisms could induce migration of myoma. UPA as pre-operative treatment can induce migration of myoma and, therefore, can lead to perioperative conversion of surgery.