Thoracic aortic aneurysm is a condition in which a weakened area of the aorta in the chest enlarges over time, increasing the risk of rupture or dissection if left untreated. Diagnosis is typically made using imaging tests such as CT scans, MRI, or ultrasound to assess the size and location of the aneurysm. Treatment depends on the aneurysm's size, growth rate, symptoms, and overall health of the individual, and may include regular monitoring, medications, endovascular repair, or open surgery. Early diagnosis and appropriate management can help reduce the risk of complications and support long-term aortic health.