We report an unusual case involving a 70-year-old man with multiple co
ronary aneurysms, including a 5-cm aneurysm of the right coronary arte
ry. The precise size was determined with magnetic resonance imaging, a
lthough the aneurysms were diagnosed initially on angiography. Multipl
e coronary aneurysms are rare in adults. The cause may have been ather
osclerosis, syphilis, or collagen vascular disease, all of which cause
weakening of the media. The patient underwent successful operation, i
ncluding coronary artery bypass grafting.