My dad also died of an undiagnosed aortic aneurism, so suddenly that we never had the chance to say goodbye. He was 75 and had been suffering from Polymialgia Rheumatica for which he was being successfully treated with prednisolone. Coincidentally, I have also had PMR and had the same treatment. It's not known if the two conditions are connected, but it is known that there is aortic aneurisms can be hereditary. As my sister was diagnosed with this, she urged me to have a scan which my GP was happy to sanction. Luckily it came up negative, though it did let me know I had gall stones. It would make sense for scanning to be routine, as it's just as easy as a pregnancy scan.