Table 2.

5-Year Cumulative Rupture Rates According to Size and Location of Unruptured Aneurysm and According to Patient Group, Among Patients in the Unoperated Cohort of ISUIA

AC, anterior communicating or anterior cerebral artery; Cavernous, cavernous carotid artery; IC, internal carotid artery (not cavernous carotid artery); MC, middle cerebral artery; Post-P comm, vertebrobasilar, posterior cerebral artery system, or the posterior communicating artery.

^*Patients in group 1 had no history of subarachnoid hemorrhage.

^†Patients in group 2 had a history of subarachnoid hemorrhage from a separate aneurysm.