Figure 4. Detail of (a) chest radiograph and (b) axial MR image in a patient with a right-sided aortic arch. Note the right paratracheal "mass" (arrows) with tracheal displacement to the left in (a) and superior vena cava (SVC) (large arrow) and trachea (small arrow) in (b). A central venous catheter is present in the SVC in (a).