Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly tortuous . Hilar and mediastinal contours are otherwise unchanged . Pulmonary vasculature is not engorged . Linear opacities in the lung bases likely reflect areas of subsegmental atelectasis or scarring . Scarring is also noted in the upper lobes bilaterally . No focal consolidation , pleural effusion or pneumothorax is present . Previously described opacity projecting over the level of the undersurface of the aortic arch appears to correlate to a calcified mediastinal lymph node . Degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Previously described focal opacity projecting over the undersurface of the aortic arch correlates with a calcified mediastinal lymph node , likely the sequela of prior granulomatous disease . ___ , MD