There are 2 options for participation in this study:

• You can choose to join a registry; OR
• You can participate in a randomized trial

If you choose to join the registry portion of the study, we will collect information from your medical records related to your surgery to repair your aortic aneurysm. In addition to getting information from your records here, we will also call you or meet with you during your regularly scheduled visits to fill out questionnaires. We will begin collecting this information shortly before your surgery and then for up to 10 years after your surgery. If you choose to join the randomized trial, you will get a random assignment (like a coin flip) to 1 of 2 groups:

• One group will be treated with surgery and medication to repair aortic aneurysm
• The other group will be treated with only medication and will be monitored to track how well the aortic aneurysm is healing

If you are assigned to the surgery group, your doctor will surgically repair your aorta according to standard practices. If you are assigned to the surveillance group (monitoring and medication), you will be followed according to your doctor's routine care. Similar to the registry option, we will also collect medical information before treatment begins and for up to 10 years afterward for people who are assigned to either the surgery or surveillance groups.