Saphenous vein graft (SVG) aneurysm is a rare complication seen after coronary artery bypass grafting (CABG) and generally develops about 10 to 20 years after CABG. It can be asymptomatic or cause myocardial infarction (MI). In this case we present a 53-year old man hospitalized with MI within one month after CABG and detected to have SVG aneurysms. He had triple CABG (one of them was internal mammarian artery, two of them were SVG) one month ago. His grafts were open and no thrombotic occlusion was detected in native vessels or grafts in control coronary angiography. In addition, the diameters of SVGs were aneurysmatic and a thrombus was detected within one. No cardiac event has developed over the six months of follow-up in the patient who was discharged after initiation of Warfarin therapy. In conclusion, SVG aneurysm may cause MI not related to thrombotic occlusion in the early period after CABG. Copyright © 2013 by Türkiye Klinikleri.