Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is moderately enlarged . The patient is status post median sternotomy and CABG . Aortic knob calcifications are noted , and the mediastinal contours are within normal limits . Mild upper zone vascular redistribution is seen suggesting pulmonary vascular congestion . Interstitial abnormality within the lung bases may reflect atelectasis or chronic changes . No focal consolidation , pleural effusion or pneumothorax is present , with mild biapical pleural parenchymal scarring noted . Marked degenerative changes in the left glenohumeral joint are present .
    OUTPUT:
    
Mild pulmonary vascular congestion . Bibasilar interstitial abnormality , either atelectasis or chronic changes . No evidence of superior mediastinal widening .