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Table 2: 
Prevalence of FMD, dissection and/or pseudoaneurysm, aneurysm/ectasia, and webs based on arterial involvementa
Right Carotid ArteryLeft Carotid ArteryBoth Carotid ArteriesRight Vertebral ArteryLeft Vertebral ArteryBoth Vertebral Arteries
FMD56 (25.2%)49 (22.9%)39 (18.2%)30 (14.0%)32 (15.0%)22 (10.3%)
Dissection and/or pseudoaneurysm5 (2.3%)8 (3.7%)0 (0.0%)8 (3.7%)12 (5.6%)1 (0.5%)
Aneurysm/ectasia16 (7.5%)13 (6.1%)8 (3.7%)4 (1.9%)3 (1.4%)1 (0.5%)
Web6 (2.8%)6 (2.8%)0 (0.0%)NA
  • Note:—NA indicates not applicable.
  • ↵a The presence or absence of webs within the vertebral arteries was not assessed because they are classically found in the carotid bulbs. Data are No. (%).