An estimated 13,000-14,000 UFE procedures are performed annually in the U.S. (as of 2004)Embolization of the uterine arteries is not new. It has been used successfully by interventional radiologists for more than 20 years to treat heavy bleeding after childbirth.Embolization has been used to treat tumors since 1966. Embolization to treat uterine fibroids has been performed since 1995 and the embolic particles are approved by the FDA specifically to treat uterine fibroid tumors, based on comparative trials showing similar efficacy with less serious complications compared to hysterectomy and myomectomy (the surgical removal of fibroids).Embolization of fibroids was first used as an adjunct to help decrease blood loss during myomectomy. To the surprise of the initial users of this method, many patients had spontaneous resolution of their symptoms after only the embolization and no longer needed the surgery.