Depending on the location of the aortic tear, it may be necessary for the interventional radiologist to place the stent graft over the origin of an artery in your chest, which would result in a decreased blood supply to your left arm. This may lead to weakness of the arm, dizziness and ischaemic injuries to your brain. If you experience these symptoms, the artery will be treated to improve blood flow.
In some cases, it is not possible to separate the false lumen, which would make it necessary for you to undergo further treatment. Other risks include the misplacement of the stent-graft and the rupture of the vein used for access, but these are rare.