Endovascular techniques can be used to treat aneurysms without opening the skull. An endovascular procedure is performed in the angiography suite under general anesthesia. A very thin, flexible tube called a catheter is introduced into an artery, usually at the groin, through which coils or a glue-like material fills the aneurysm and blocks off its blood supply. This technique is called embolization. Materials used for aneurysm embolization include platinum coils.