Vascular aortic anyerisum

Aortic aneurysm. means pathological increase in diameter of aorta which is the largest artery in chest and abdomen.
Depends on size. You should have this monitored regularly and at a certain point your doctor will recommend surgery, if aneurysm continues to grow. Take his advice. I am assuming this is an abdominal aortic aneurysm, but if it is thoracic, there are different treatment options depending upon exact location.
Arterial dilation. The enlargement f an artery. Generally twice the native arteries diameter.