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Demographics No. % Sex Male 35 36.1 Female 62 63.9 Aneurysm location MCA 57 54.2 AcomA 30 28.6 Basilar tip 17 16.2 Carotid termination 1 1.0 Clinical finding Incidental discovery 79 75.2 Recurrence 20 19.0 SAH 5 4.8 Compression 1 1.0 Aneurysm size Small: 0–10 mm 90 85.7 Large: 10–25 mm 13 12.4 Giant: >25 mm 2 1.9 Aneurysm Size (No.) (%) Mean ± σ (mm) Ruptured (No.) (%) Complex (No.) (%) Small: 90 (85.7) 5 (5.5) 27 (30.0) Largest diameter 6.5 ± 2.1 Neck 5.0 ± 1.3 Dome/neck 1.1 ± 0.3 Large: 13 (12.4) 0 (0) 7 (54.0) Largest diameter 12.7 ± 2.6 Neck 6.8 ± 2.0 Dome/neck 1.6 ± 0.7 Giant: 2 (1.9) 0 (0) 0 (0) Largest diameter 28.3 ± 3.9 Neck 5.5 ± 1.1 Dome/neck 2.3 ± 1.7 Age (yr), Sex Aneurysm Location Aneurysms Treated during the Procedure Stents Event Final Result F/U mRS Score 50, F MCA 1 0 Sac perforation with the guidewire C – 0 62, F MCA 1 0 Sac perforation with the microdelivery stent system and exchange guidewire A – 4 70, F MCA 2 1 First stent was delivered too distally, with the proximal end covering the neck; impossible to navigate the microcatheter in the second branch C, C B, B 0 38, M AcomA 1 1 Guidewire tip broke in the parent vessel and a single stent was delivered due to the impossibility of navigating the microcatheter in the second branch C A 0 48, F MCA 1 2 First stent was delivered too distally, no overlapping C C 0 30, F AcomA 1 2 First stent was delivered too distally, no overlapping B A 0 86, F BA 1 2 First stent fell into aneurysmal sac, no overlapping C C 2 51, F CT 1 2 First stent fell into aneurysmal sac, no overlapping C – 0 58, F AcomA 2 2 Second stent was deployed inside the first one (coaxial) C, C C, C 0 Note:—F/U indicates follow-up; BA, basilar artery; CT, carotid termination; A, complete occlusion; B, neck remnant; C, sac remnant.