How can you see a ruptured abdominal aortic aneurysm on abdominal x-ray?

I was was listening to a vascular surgeon, who mentioned that there was an indication of a partially ruptured abdominal aortic aneurysm see on an abdominal x-ray. I have no idea how he saw this or what to look for.

Can anyone give me some hints please?

Authored By Rebecca Stafford on Saturday 1st December 2012