Answer Question #4

Retrograde flow in the left vertebral artery by phase-contrast imaging usually indicates significant stenosis in the:

• a) Brachiocephalic artery
  
• b) Left common carotid artery
  
• c) Distal left vertebral artery
  
• d) Proximal left subclavian artery
  
• e) Basilar artery

The correct answer is d)

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