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Table 4: Comparison of diagnostic criteria and outcomes
Diffuse Intracranial Dolichoectasia Vertebrobasilar Dolichoectasia^{^a}
Imaging appearance Fusiform aneurysmal dilation of an entire vascular segment (ie, supraclinoid ICA, basilar artery, M1 segment of the MCA) Fusiform: aneurysmal dilation without definable neck involving a portion of an arterial segment with any degree of tortuosity
Dolichoectatic: uniform aneurysmal dilation of an artery involving the entire basilar or vertebral or both with any degree of tortuosity
Transitional: uniform aneurysmal dilation of an artery with superimposed dilation of a portion of the involved arterial segment
Distribution ≥2 Intracranial vascular beds (ie, vertebrobasilar system, left anterior circulation, or right anterior circulation) Vertebrobasilar system only
Size criteria Cavernous ICA: ≥8.5 mm
Supraclinoid ICA: ≥8.0 mm
MCA: ≥5.0 mm
Basilar artery: ≥6.0 mm Basilar artery diameter of >5.0 mm
Growth rate 10%/year 7%/year^2,10
Ischemic stroke risk 11%/year 3%/year^2,10
Aneurysm rupture risk 6%/year 2%/year^2,10
↵a Definitions of vertebrobasilar dolichoectasia proposed by Flemming et al.²