After making a tiny incision in the groin, your surgeon will insert a long, thin tube, called a catheter, through the femoral artery. The catheter is guided through the circulatory system using X-ray imaging until it reaches the location of the abnormal blood vessel being treated. The surgeon then injects an embolizing agent, such as tiny plastic particles, metal coils, or glue-like agents, to block the artery and reduce or stop the blood flow.