DEAR DOCTOR K: I had pain in my abdomen, so my doctor did an ultrasound to check for gallstones. It turns out I have an abdominal aortic aneurysm. What is that?
DEAR READER: The aorta is the body's largest artery. It carries oxygen-rich blood from the heart to every part of the body. The aorta curves out of the heart and through the chest, then passes down the center of the body before dividing into the arteries that serve the legs.