Table 1

Location of the 221 aneurysms

LocationAneurysm (n (%))
Anterior circulation
 Middle cerebral artery11 (5)
 Supraclinoid internal carotid artery
  Posterior communicating artery64 (29)
  Superior hypophyseal artery1 (0.45)
  Anterior choroidal6 (2.7)
  Ophthalmic artery71 (32.1)
 Anterior communicating artery40 (18.1)
 Carotid bifurcation2 (0.91)
 Pericallosal artery4 (1.8)
Posterior circulation
 Basilar tip6 (2.7)
 Basilar trunk1 (0.45)
 Posterior cerebral artery3 (1.4)
 Posterior inferior cerebellar artery3 (1.4)
 Vertebral artery9 (4.1)
Total221