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Characteristics of patients, aneurysms, and treatments according to the initial angiographic follow-upa
CharacteristicsBOSS 1 (n = 20)BOSS 0, 0′, 2, 3, and 3 + 1 (n = 200)P Value
Patient
 Age (mean) (yr)56.8 (SD, 10.9)55.7 (SD, 11.3).669
 Female14 (70)129 (65).623
 Current smoker3/18 (17)70/185 (38).074
Aneurysm
 Acutely ruptured4 (20)57 (29).418
 Irregular10 (50)97 (49).90
 Maximum diameter (mean) (mm)6.4 (SD, 1.8)6.4 (SD, 2.4).904
 Height (mean) (mm)4.8 (SD, 1.7)5.3 (SD, 2.2).211
 Neck (mean) (mm)4.4 (SD, 1.6)3.8 (SD, 1.2).113
 Width (mean) (mm)5.3 (SD, 1.5)5.0 (SD, 1.8).448
 Aspect ratio (height/neck) (mean)1.11 (SD, 0.44)1.38 (SD, 0.53).016
 Width/neck ratio (mean)1.23 (SD, 0.27)1.31 (SD, 0.30).220
Location
 MCA12 (60)89 (44.5)Ref23
 AcomA3 (15)60 (30).137
 TCarotid3 (15)9 (4.5).218
 BA0 (0)17 (8.5).992
 Other2 (10)25 (12.5).512
Treatment
 Type of WEB
  WEB-SL16 (80)152 (76)Ref23
  WEB-DL1 (5)13 (7).770
  WEB-SLS3 (15)35 (18).754
  WEB 1717 (85)126 (63).049
 Additional stent2 (10)8 (4).227
 Antiplatelet therapy (>1 week)15 (75)92 (46).013
 WShM (%)30 (9–36)39 (21–52).014
  • Note:—AcomA indicates anterior communicating artery; TCarotid, internal carotid artery terminus; BA, basilar artery; WEB-SL, WEB single-layer; WEB-DL, WEB dual-layer; WEB-SLS, WEB single-layer sphere; BOSS 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 agent media depicted inside and around the device.6
  • ↵a Data are presented as number (%) for qualitative variables and as the mean (SD) or as the median (interquartile range) for quantitative variables (according to their distribution). Smoking status was missing for 17 patients.