Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a round focal opacity projecting over the aortic arch on lateral view , not present previously . No corresponding opacity is identified in the frontal view . Heart is borderline enlarged . Pulmonary vasculature , mediastinal and hilar silhouettes are normal . There is a pacemaker with 2 right ventricular leads and a retracted lead coiled around the pacemaker .
    OUTPUT:
    
CT is recommended to evaluate possible supraaortic lung mass .