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TABLE 2: 
Location of aneurysms
Anterior Circulation61Posterior Circulation19
 Internal carotid artery20 Vertebral artery4
  Internal carotid termination4 Basilar artery9
  C112 Posterior cerebral artery4
  C23 Posterior inferior cerebellar artery2
  C31
 Middle cerebral artery9
 Anterior cerebral artery3
 Anterior communicating artery29