This study is testing a new device called Arcevo LSA, which is a type of stent graft. A stent graft is a special tube that doctors put inside blood vessels to help them stay open and strong. This study is for people with problems in their aorta, a big blood vessel in your body. These problems could be an aortic dissection, where the layers of the blood vessel wall split, or an aneurysm, a bulge in the blood vessel wall. The study is for adults between 18 and 80 years old. It is important to know that if you are pregnant or have certain other health problems, you might not be able to join.

• The study requires surgery within 90 days after consent.
• Participants must agree to regular follow-up visits to check their health.
• There are some risks and benefits which you should discuss with your doctor.