Fig. 2

CT scan of the lungs and mediastinum with and without contrast. a An enlarged mass exists in the mediastinum. b Venous phase of CT with contrast shows that the aortic arch is encased by a mass which is not enhanced
CT scan of the lungs and mediastinum with and without contrast. a An enlarged mass exists in the mediastinum. b Venous phase of CT with contrast shows that the aortic arch is encased by a mass which is not enhanced