92 Chapter 5 Table 2. Aneurysm location Surgical group Endovascular group Location Number (%) Number (%) ICA 27 (13.6) 69 (28.3) - Cavernous - 2 - Ophthalmic - 4 - PCoA 20 54 - Anterior choroidal artery 3 - - Bifurcation 4 9 ACA 79 (39.7) 110 (45.1) - A1 5 1 - ACoA 66 102 - A2 8 7 MCA 89 (46.1) 24 (9.8) - Proximal (M1) 19 3 - Bifurcation 62 19 - M2 5 2 Posterior circulation: 7 (3.6) 41 (16.8) - Vertebral artery - 1 - Basilar artery junction - 27 - SCA - 3 - PCA 1 2 - PICA 6 8 Total 199 (100) 244 (100) ACA = anterior cerebral artery PCoA = posterior communication artery ACoA = anterior communicating artery PICA = posterior inferior cerebellar artery ICA = Internal carotid artery SCA = superior cerebellar artery PCA = posterior cerebral artery Regarding the mean clinical grading specified in Table 3, the clinical condition before treatment in the surgical group was significantly better than that in the group undergoing endovascular treatment (p=0.018). Table 3. Clinical grading at presentation Surgical group Endovascular group HH Number (%) Number (%) 1 64 (37.0) 65 (28.2) 2 56 (32.4) 65 (28.2) 3 17 (9.8) 42 (18.3) 4 23 (13.3) 29 (12.6) 5 13 (7.5) 29 (12.6) Total 173 230 Follow-up Clinical follow-up was performed in the endovascular and surgical groups during outpatient clinic visits. The report of the outpatient visits was missing in 43 patients. In those patients the clinical follow-up was obtained by structured telephone interviews, and by information provided by the general practitioner. Patients with a clinical follow-up period of less than one year were considered to be lost to follow-up. The clinical outcome was determined according to the following modified Rankin scale (mRS) criteria:13 0 = no symptoms, 1 = no significant disability, despite symptoms, 2 = slight disability, 3 = moderate
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