This study is looking for volunteers that are about to be or have been treated with a Valiant Navion™ Thoracic Stent Graft System. This will be referred to as the "Stent Graft System" throughout this form. Medtronic wants to collect information about the safety and performance of this system in patients who have a dissection of the thoracic aorta.

This study is being conduct to assess the safety and effectiveness of a Study Sevice,GORE® EXCLUDER® Conformable AAA Endoprosthesis, in patient's with an aneurysm in their abdominal aorta. In this research study, the Study Device will be placed inside the abdominal aorta (in the approximate area of the belly button) and the Study Device will extend into both leg arteries. The Study Device will block the aneurysm (the weakened and bulging part of the artery) in the abdominal aorta from blood flow while maintaining blood flow to the arteries in the legs. Information will be collected on the performance of the Study Device for up to five (5) years.