Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unchanged . There are atherosclerotic calcifications noted within the aortic arch . The pulmonary vasculature is normal . Patchy opacity within the lateral aspect of the left lung base likely reflects a combination of previously demonstrated scarring or fibrosis . No new focal consolidation , pleural effusion or pneumothorax is seen . Previously described pulmonary nodules on CT are not well assessed on the current exam . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Previously demonstrated nodules on CT are not well visualized on the current exam .