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Arterial thoracic outlet syndrome due to a bony abnormality. (A) Compression of the right subclavian artery (arrow) in the costoclavicular space due to an anomalous cervical rib; (B) VRT image with bone showing the cervical rib (arrowhead) uniting with the first rib; (C) VRT of the right subclavian artery showing irregularity at the compression site. VRT, volume rendering technique.
