Table 2

Aneurysm and treatment characteristics

Aneurysm characteristics (n=945)N (%) or mean±SD
Status
Ruptured614 (65.0)
Unruptured331 (35.0)
Aneurysm size*
<10 mm816 (86.3)
≥10 mm129 (13.7)
Wide neck
Yes557 (58.9)
No388 (41.1)
Aneurysm location
ACA/Acom363 (38.4)
MCA198 (20.9)
ICA intradural290 (30.7)
ICA extradural14 (1.5)
VB80 (8.5)
Aneurysm shape‡
Regular269 (28.5)
Irregular676 (71.5)
Treatment
Coiling516 (54.6)
BAC429 (45.4)
  • *Maximum diameter.

  • †Wide neck defined as neck size ≥4 mm and/or dome to neck ratio <2.

  • ‡Regular when there was a single sac with smooth margin and irregular if there was a single sac with irregular margin and/or a daughter sac and/or a multilobulated aneurysm.

  • ACA/Acom, anterior cerebral/communicating artery; BAC, balloon-assisted coiling; ICA, internal carotid artery; MCA, middle cerebral artery; VB, vertebrobasilar.