Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart is moderately enlarged . The mediastinum is slightly widened , likely related to rotation and mediastinal fat with distinct contours . The lungs are grossly clear without focal or diffuse abnormality . No pleural effusion or pneumothorax . Osseous structures are unremarkable . No radiopaque foreign body .
    OUTPUT:
    
Low lung volumes . Moderate cardiomegaly .