Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Vascular stent is noted within the right subclavian artery . Heart size is normal . Coronary arterial vascular stent is also demonstrated . The mediastinal and hilar contours are unchanged . The pulmonary vascularity is normal . There is hyperinflation of the lungs with attenuation of the pulmonary vascular markings towards the apices , compatible with emphysema . Minimal interstitial opacities are seen predominantly within the lung bases , likely reflecting chronic changes . No focal consolidation , pleural effusion or pneumothorax is present . There are mild degenerative changes of the thoracic spine . Degenerative spurring is also noted within the right acromioclavicular joint .
    OUTPUT:
    
Emphysema with chronic interstitial changes , but no evidence for pneumonia or congestive heart failure .