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Fig. 1A. —CT angiograms of left thoracic outlet in 59-year-old woman with paresthesias. Numeral 1 refers to measurement of costoclavicular distance. Sagittal reformations of costoclavicular space in neutral position. Minimal and maximal distances between inferior border of clavicle and superior margin of first rib are 7 mm on A and 11 mm on B, respectively. Note, on B, distance between inferior border of subclavius muscle and superior margin of first rib (numeral 2) is 6 mm. Also note posterior location of subclavian vein (asterisk) and artery (triangle) relative to costoclavicular space, and inferior location of subclavius muscle (circle) relative to clavicular margin.