The authors are reporting the case of a 74 year old man, presenting a renal artery aneurysm. Regarding clinical aspects, medical treatment was elected. The most frequent cause of renal infarct is embolisation arising from the heart, followed by large vessels emboli that are more exceptional. Embolisation arising from the renal artery aneurysms is not very common. Unless contra-indications, surgical cure of the aneurysm is necessary, except those that are non complicated, with a diameter of less than 1.5 cm.