An elderly woman underwent coronary artery bypass grafting, which was followed 1 month later by pseudoaneurysmal rupture at the distal anastomosis of a saphenous vein graft. Emergency repair of the suture line dehiscence was made, and the postoperative course was uneventful. Pseudoaneurysm formation of a saphenous vein graft after coronary artery bypass grafting is a rare but potentially lethal complication requiring urgent operative intervention.