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Table 1: 
Distribution of aneurysm locations
SiteGroup 1 (%)Group 2 (%)
ACA31.5
AchoA<14.5
AcomA3715
AICA20
PCA2.53
BA tip47.5
ICA5.514
MCA2244
PcomA209
PICA31.5
  • Note:—ACA indicates anterior cerebral artery (all segments included); AchoA, anterior choroidal artery; AcomA, anterior communicating artery; AICA, anterior inferior cerebellar artery; PCA, posterior cerebral artery (all segments included); BA, basilar artery; ICA, internal carotid artery (supraclinoid portion only; PcomA and AchoA aneurysms are considered separately); MCA, middle cerebral artery (all segments included); PcomA, posterior communicating artery-ICA junction; PICA, posterior inferior cerebellar artery. Bold- face type within each group indicates the first 3 more frequent locations.