It has eventually become so technologically advanced, that it is a highly advantageous procedure with minimal risk and a better long-term treatment compared to previous procedures. Fibroids in the uterus are tumor-like tissues that can be malignant, though are usually benign. However, these fibroids cause obstructions in the uterus, creating heavy menstruation, pelvic pain and increased pressure on the bladder and bowels. This technique has since been deemed successful to treat the fibroids and according to the article Uterine Fibroid Embolization, there has been a 90 percent success rate for up to five years for the patient and, dependent on the type of fibroid the woman has, is the number one treatment used for most women. The only time it is less effective long-term is when women have larger ovarian arteries, allowing blood to flow more to the fibroid. Technological advances have helped uterine fibroid embolization become even more effective and is becoming more simple in technique. When the technique was first introduced, standard sized catheters were used in the process within the arteries, creating spasms and pain in the vaginal area. Since then, micro-sized catheters are instead used, contouring more effectively with the body, eliminating the muscle contractions during this procedure and resulting in more satisfactory outcomes.