Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation on the frontal view . However , there is increased retrocardiac opacity on the lateral view , likely related to expiratory phase and atelectasis . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are enlarged , unchanged .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormalities . 2 . Stable moderate to severe cardiomegaly .