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Fig. 1D. —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 after postural maneuver show narrowing of superoinferior distances measured between bony structures and between subclavian muscle and first rib. Note, on D, stenosis of subclavian artery (triangle). Also note, on D, location of subclavian vein (asterisk, D) below horizontally oriented subclavius muscle (circle, D). Note, on C, precise delineation of lower portion of anterior scalene muscle (arrowhead, C), in close contact with subclavian artery (triangle). Numeral 2 refers to distance between inferior border of subclavius muscle and superior margin of first rib.