Descending Aortic Aneurysm

The goal of this observational study is to assess the applicability of non-invasive ultrasound in aneurysms of the descending thoracic aorta. The main question it aims to answer is: What is the feasibility of Ultrasound to visualise the Descending Thoracic Aorta, and can this imaging modality accurately measure the maximum size of aneurysms and residual sacs with acceptable reproducibility? Participants are having their diagnosis confirmed or excluded by conventional imaging techniques (CT scans). Participants receive exactly the same standard of care regardless of their participation. The study offers an additional ultrasound scan, and the results will be compared with previous imaging.