The Patient Received the Proper Treatment

The patient received the proper treatment. 4 weeks later, she presented with occasional dizziness. Her symptoms occur usually while she combs her hair. She did not lose consciousness. She was evaluated for orthostatic hypotension, and the evaluation was normal. She has a normal ECG with a normal sinus rhythm. MR angiography shows delayed enhancement of the left vertebral artery, with retrograde flow. Which of the following arteries is most likely to be occluded based on these findings?

A) Brachiocephalic Artery
B) Left External carotid
C) Left subclavian
D) Right vertebral

Correct Answer:

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