 CARAT trial has shown that the risk of rebleeding after aneurysm coiling is significantly associated with the quality of aneurysm occlusion. The risk of rebleeding is 1.1 in case of complete occlusion, 2.9 when aneurysm occlusion is between 91 and 99, 5.9 when aneurysm occlusion is between 70 et 90, and 17.6 when aneurysm occlusion is less than 70. However it should be outlined that few studies have clearly analyzed the relation between recanalization and rebleeding. 