The diagnosis of a<unk>  aortic aneurysm is often made as an incidental finding on either chest x-ray (widening of the mediastinum), on transthoracic echocardiography (dilated aortic root) or on trans esophageal echocardiography (enlarged ascending aorta or aortic arch).  The definitive diagnosis is made using CT angiography but MRA is also an excellent test. Once diagnosed, serial CTA (or MRA) are recommended every 6-12 months.  The frequency of surveillance imaging should be increased if the aneurysm is larger at baseline, if there is a recent history of<unk> elerating expansion, if the patient is pregnant,  and if the patient has marfan syndrome, loeys-dietz syndrome or a confirmed genetic mutation known to predispose to aortic aneurysms and aortic dissections (TGFBR1, TGFBR2, FBN1, ACTA2, or MYH11).  Indeed in these high risk syndromes, the patient should undergo complete aortic imaging at the time of the initial diagnosis and then every 6 months to determine if enlargement is occurring.  Bicuspid aortic valve, coarctation of the aorta, and/or dilatation of the ascending<unk>  aorta should be excluded in a patient with turner's syndrome.  Follow-up imaging should be obtained every 5 to 10 years in the patient with turner's syndrome if the initial imaging is normal, and yearly if any abnormalities are present.  Patients with bicuspid aortic valve disease and first-degree relatives of patients with bicuspid aortic valve disease should undergo imaging to rule out the presence of the<unk>  aortic aneurysm.
Thoracic aortic aneurysm ACC/ AHA guidelines for aortic imaging techniques
Thoracic aortic aneurysm echocardiography or ultrasound
Aortic dissection imaging in acute aortic dissection
Thoracic aortic aneurysm physical examination
Aortic dissection physical examination
Carcinoid syndrome echocardiography or ultrasound
Aortic sclerosis echocardiography and ultrasound
Unstable angina/NSTEMI Antiplatelet therapy recommendations