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Fig. 3B. —Costoclavicular space with arms hyperabducted. 1 = clavicle, 2 = subclavian artery, 3 = subclavian vein, 4 = cords of brachial plexus, 5 = first rib, 6 = subclavius muscle, 7 = lung. Sagittal T1-weighted MR image of 31-year-old female volunteer shows costoclavicular space. Note narrowing of costoclavicular space when compared with that in Figure 2A,2B. Note also slight compression of subclavian vein.