Factors Affecting Successful Embolization of Intracranial Aneurysms with Guglielmi Detachable Coils

To predict the angiographic outcome of coil embolization of aneurysms using Guglielmi detachable coils (GDCs), we evaluate angiographic findings after the initial treatment and follow-up angiography. Between May 1998 and October 2006, 94 intracranial aneurysms of 88 patients underwent endosaccular embolization with GDCs and follow-up angiography. We statistically analyzed the relationships between aneurysm size, volume embolization ratio (VER), aspect ratio (AR) and arterial geometry and findings on follow-up such as complete occlusion (CO) or incomplete occlusion (ICO). The geometry of the parent artery was subdivided into 3 categories; bifurcation, branching and lateral type. Following the initial treatment, we obtained CO in 74 aneurysms (78.7%) and ICO in 20 aneurysms. Of 74 CO cases, three cases later recanalized and were categorized as ICO. Progressive thrombosis was detected in 10 of 20 ICO cases on follow-up angiography. Branching or lateral aneurysms showed a high tendency toward CO. VER and size of aneurysm did not show any statistical difference between the two groups. However, the difference in AR was significant (p