Smoker's criteria for vertebrobasilar dolichoectasia
Basilar artery diameter
Laterality
Height of bifurcation
Elongation is indicated by abnormal laterality or height, ectasia is indicated by abnormal diameter, and doliechoectasia is indicated by the presence of both elongation and ectasia.
References
- High-Resolution Computed Tomography of the Basilar Artery: 1. Normal Size and Position. AJNR Am J Neuroradiol. 1986;7(1):55-60