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Fig. 2B. —CT angiograms of left thoracic outlet in neutral position in same 59-year-old woman with paresthesias as in Figure 1A,1B,1C,1D. Contiguous sagittal reformations shows close contact between anterior wall of subclavian artery (arrow) and posterior border of anterior scalene muscle (arrowhead). Note modification of shape of subclavian artery, rounded in B and oval in C, as it reaches lateral border of anterior scalene muscle.