In cases of common carotid occlusion, heavy collateralization through the ECA can maintain forward flow within the ICA.
The term “subclavian steal” describes a similar phenomenon by which the vertebral artery flows in a retrograde fashion due to proximal subclavian artery occlusion.
For a larger image, please click on Doppler Ultrasound 5 .
A) Atherosclerotic plaque
B) Aortic coarctation
C) Aortic Aneurysm
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