From:  Intracranial artery dolichoectasia: What should the neurologist know?

Diagnostic criteria for IADE based on AngioCT

ItemsParameters
Basilar artery diameter*0 1.9–4.5 mm
1 > 4.5 mm (ectasia)
Laterality▲0 Midline
1 Mid-lateral margin of the clivus or dorsum sellae
2 Lateral-lateral margin of the clivus or dorsum sellae
3 Cerebellopontine angle
Bifurcation height▲0 Dorsum sellae or below
1 Suprasellar cistern
2 At the level of the third ventricle
3 Recession and elevation of the floor of the third ventricle
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AngioCT: computed tomography angiography; IADE: intracranial arterial dolichoectasia; mm: millimeters; * value of 1 is deemed abnormal; ▲ value of 2 or more suggests abnormality