Inclusion Criteria:  All patients, aged 18 or greater, admitted or referred to the participating vascular surgery centres with an acute (< 14 days) or subacute (<90 days) uncomplicated type B aortic dissection.  Exclusion Criteria:  Patients presenting with a complicated type B aortic dissection. Patients previously treated in their descending aorta, either open surgery or TEVAR. Patients with pre-existing thoracoabdominal aortic aneurysm. Patients with an established connective tissue disease at the time of randomization, including but not limited to Marfans and Loeys-Dietz syndrome. Patients with bilaterally occluded iliac arteries. Patients with a clinically estimated life expectancy < 2 years. Patients with dementia. Pregnant or nursing patients. Patients with current sepsis. Patients currently participating in other clinical interventional trials.