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Fig. 5B. —Retropectoralis minor space with arms hyperabducted. 1 = coracoid process, 2 = axillary artery, 3 = axillary vein, 4L = lateral nerve cord of brachial plexus, 4M = medial nerve cord of brachial plexus, 4P = posterior nerve cord of brachial plexus, 5 = pectoralis minor muscle, 6 = serratus anterior muscle, 7 = subscapularis muscle, 8 = lung. Sagittal T1-weighted MR image of 36-year-old female volunteer shows retropectoralis minor space. Note narrowing of retropectoralis minor space when compared with that in Figure 4A,4B. Note also contact between neurovascular structures and posterior side of pectoralis minor muscle and anteroposterior compression of axillary vein.