The subclavian artery leaves the thorax by passing over the first rib and between these 2 portions of the scalenus anterior muscle. At the level of the first rib, the lower cervical nerve roots ...
demonstrating a type IV cervical band IV (arrows) and neurogenic-arterial compression. A = artery (subclavian-axillary); LRA = left robotic arm; N = nerve C8/T1; R = rib; RRA = right robotic arm.
Arterial TOS is caused by a narrowing in the main artery to the arm (subclavian artery) which invariably is secondary to a congenital extra rib (cervical rib) which lies at the base of the neck, just ...
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