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Fig. 3D. —Volume-rendered reconstructions of left thoracic outlet in 56-year-old woman with exercise-induced complaints. Measurements of angle (arrows) of transverse arch on vertical views before (C) and after (D) postural maneuver. Note, on C, arch of subclavian artery around anterior scalene muscle (asterisk, C), then concave course of arterial structure toward subcoracoid tunnel. On D, note arch of subclavian artery above first rib and nearly straight course of axillary artery after postural maneuver.