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Table 1: 
Definition of vascular segments and aneurysmal dilation
Vascular SegmentDefinition of Vascular SegmentDefinition of Aneurysmal Dilation
Cavernous ICAEntry point of ICA into the cavernous segment to the ophthalmic artery origin≥8.5 mm
Supraclinoid ICAICA from the ophthalmic artery origin to the ICA bifurcation≥8.0 mm
M1 segment of MCAOrigin of MCA to the MCA bifurcation≥5.0 mm
Basilar arteryConfluence of vertebral arteries to the basilar bifurcation≥6.0 mm