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Table 2: Immediate and follow-up results of the treated aneurysms according to the BOSS classification¹²
BOSS Classification RROC Grades Immediate (n) Ratio BOSS (%) Ratio RROC (%) FU1 (n) Ratio BOSS (%) Ratio RROC (%) FU2 (n) Ratio BOSS (%) Ratio RROC (%)
47 36 18 
0 I 14 29.8 31.9 20 55.6 63.9 13 72.2 77.8
0′ 1 2.1 3 8.3 1 5.6
1 II 28 59.6 59.6 4 11.1 36.1 1 5.6 22.2
2 0 0.0 9 25.0 3 16.6
3 III 1 2.1 8.5 0 0.0 0.0 0 0.0 0.0
1 + 3 3 6.4 0 0 0 0.0 
Note:—FU1 indicates first follow-up angiography; FU2, second follow-up angiography.
BOSS classification¹²: 0, No residual flow inside the aneurysm or the WEB; 0′, opacification of the proximal recess of the WEB; 1, residual flow inside the WEB; 2, neck remnant; 3, aneurysm remnant; 1 + 3, contrast media depicted inside and around the device. BOSS results were transferred into the RROC.¹³ RROC classification: RROC I, complete occlusion (BOSS 0 and 0′); RROC II, neck remnant (BOSS 1 and 2); RROC III, aneurysm remnant (BOSS 3 and 1 + 3).