Spontaneous Thrombosis of Significant Aneurysm Recanalization in the Long Term Follow-up of Coiled Aneurysms: Observation in Two Cases.

SUMMARY: Endovascular treatment of cerebral aneurysms with detachable coils has now been proved to be a superior alternative to open microsurgery in terms of survival free of disability at one year according to the recently published large randomized International Subaracnoid Aneurysm Trial (ISAT). However, aneurysm recanalization secondary to coil compaction is still the main problem of this technique observed in the follow-up period but treatment strategies for these regrowths are not yet well established. We present two interesting cases in which we observed a significant aneurysm recanalization at six month control angiography that was found to be spontaneously thrombosed in the late follow-up angiograms at the second and fifth years consecutively.