I agree with Angel. Noone should try to determine whether you have an aortic aneurysm by looking at an Xray. Thats about as usefull as telling as child he can determine which sweet has more sugar in by its colour.
Xrays really dont show up that much hun. Not heart related anyway. Yes they can show up lung problems, scarring, enlarged heart etc but not an aortic aneurysm. You really need to have an ECHO or some other test to investigate this. I'm not sure which test you need. Maybe someone here will be able to help.