[Giant left main coronary aneurysm without associated coronary lesions].

Left main coronary artery aneurysms are very infrequent (0.1%) and the majority are related to atherosclerotic obstructive lesions. Only a few isolated cases without associated coronary lesions have been reported until now. The management of these patients is not well established, thus both conservative and surgical treatments have been postulated. We present a case of giant left main coronary artery aneurysm with a diameter of 27.7 x 18.6 mm (the biggest reported until now) without coronary tree associated stenosis. It was treated conservatively with oral anticoagulation only and the 5 years evolution has been favourable.