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Table 1: Prevalence of various imaging findings in patients with SCAD^{^a}
Findings No. (%)
FMD 83/214 (38.8%)
Dissection and/or pseudoaneurysm 28/214 (13.1%)
Aneurysm/ectasia 22/214 (10.3%)
Carotid web 10/214 (4.7%)
1+ type of carotid tortuosity 99/214 (46.3%)
Atherosclerosis 
    None 185/214 (86.4%)
    Mild 26/214 (12.2%)
    Moderate 3/214 (1.4%)
    Severe 0/214 (0.0%)
Vertebral tortuosity 
    None 124/214 (57.9%)
    Mild 64/214 (29.9%)
    Moderate 22/214 (10.3%)
    Severe 4/214 (1.9%)
↵a FMD, dissection, pseudoaneurysm, and aneurysm/ectasia numbers reflect the number of patients with those findings in either the carotid or vertebral artery. Webs were only assessed in the carotid arteries because they are considered to be rarely present in the vertebral arteries. Subtypes of carotid tortuosity include kinks, loops, coils, and retropharyngeal and retrojugular courses. Carotid atherosclerosis and vertebral tortuosity reflect the more severe side, if asymmetry existed.