Thoracic vascular ailment. It might cause thoracic aortic aneurysm. This can be a bulging, weakened location from the wall of a blood vessel. It causes an abnormal widening or ballooning while in the upper body (thoracic) Portion of the aorta. Ultrasound will clearly show abnormalities in the shape in the aorta. https://www.sgvascularctr.com/a-comprehensive-guide-to-aortic-aneurysm-in-singapore/