Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph , lung volumes are decreased , accentuating the cardiac silhouette , which however still remains significantly enlarged . Increased retrocardiac opacity likely refelcts atelectasis . There is no overt pulmonary edema . There is no focal consolidation , pneumothorax or large pleural effusion . A right ventricular pacemaker and adjacent epicardial leads are in unchanged position .
    OUTPUT:
    
No focal abnormality to suggest pneumonia . Increased retrocardiac opacity likely reflects atelectatic changes .