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Table 1: BOSS classification of the overall patient cohort according to Caroff et al⁶
BOSS Classification Description Distribution No. (%)
0 No residual flow inside the aneurysm or the WEB 19 (28.4%)
0′ Opacification of the proximal recess of the WEB 22 (32.8%)
1 Residual flow inside the WEB 11 (16.4%)
2 Neck remnant 12 (17.9%)
3 Aneurysm remnant 3 (4.5%)
1 + 3 Contrast media depicted inside and around the device 0 (0%)

BOSS Classification	Description	Distribution No. (%)
0	No residual flow inside the aneurysm or the WEB	19 (28.4%)
0′	Opacification of the proximal recess of the WEB	22 (32.8%)
1	Residual flow inside the WEB	11 (16.4%)
2	Neck remnant	12 (17.9%)
3	Aneurysm remnant	3 (4.5%)
1 + 3	Contrast media depicted inside and around the device	0 (0%)