Embolization is a therapeutic intervention consisting of blocking an artery, by injecting a product or sometimes a fragment of muscle. It prevents the malfunction of an artery or the spreading of a disease, like angiomas for example. Embolization is often used in oncology, including liver cancer, to stop the blood supply to the tumor and thus render it necrotic. It is also common in cases of cardiac malformation of a vessel. The artery may be blocked using metal particles or a thrombogenic substance (natural or synthetic), meaning that it promotes the formation of a blood clot. The technique uses a catheter commonly inserted at the femoral artery, which will be directed toward the artery to be treated to give the injection.