Figure 3. Computed tomography angiography of the thoracic region with upper limb hyperabduction in the first case. The coronal view shows compression of the right subclavian artery (black arrow), by the clavicle (black arrowhead), first rib (white arrowhead), and cervical rib (white arrow). Mild thickening of the artery wall was also observed, but without causing significant stenosis. No aneurysm was observed.