Mild aneurysmal dilation of the distal abdominal aorta, this showed up on an unrelated mri, how common is this? history of cad

This : This is fairly common. You should be aware of your vascular risk factors such as cholesterol levels, smoking status, hypertension, etc.. A report of "mild" dilatation is sometimes the normal for an individual but it should be discussed with your physician and may warrant peridic followup examinations to check on it.

Common: Aortic aneurysm is very common and often detected on scans. They usually do not cause any symptoms until something really bad happens such as rupture. Small aneurysms do not need to be treated but they do need to be followed. Blood pressure control is very important.

Common: Enlargement of the aorta is common, although usually at older ages. Smokers and patients with certain specific inherited conditions can have aortic aneurysms. This should be followed but periodic imaging studies. Good luck.