Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta remains tortuous and diffusely calcified . Mediastinal and hilar contours are unchanged . Lungs are hyperinflated with emphysematous changes re - demonstrated . Pulmonary vasculature is not engorged . There is interval improvement in aeration of the right lung base with decreased right lower lobe opacity compatible with improving pneumonia . Left lung is clear . No new areas of focal consolidation are demonstrated . No pleural effusion or pneumothorax is seen . Moderate multilevel degenerative changes are noted in the imaged thoracic spine .
    OUTPUT:
    
Right lower lobe patchy opacity , improved from prior examination , compatible with improving pneumonia . Emphysema .