Fig. 2. Anatomical relation between subclavian vein and surrounding features at three shoulder positions. (  Left ) Sagittal multislice computed tomography at clavicular head of the sternocleidomastoid muscle. (  Right ) Sagittal multislice computed tomography at midclavicular line. (  A ) Elevated shoulder position; (  B ) neutral shoulder position; (  C ) lowered shoulder position. 1rb = first rib; 2rb = second rib; a = subclavian artery; cl = clavicle; v = subclavian vein.