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Left subclavian steal phenomenon

The proximal part of left subclavian is blocked on the left side. Blood flow is antegrade in the right vertebral artery but retrograde in the left vertebral artery, which supplies the distal left subclavian artery. (Courtesy of Wikimedia Commons. Illustration by User:Rajtheja on July 5, 2013. Creative Commons Attribution 3.0 Unported [CC BY 3.0] license, creativecommons.org/licenses/by/3.0.)

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