Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again mild - to - moderately enlarged . The mediastinal and hilar contours appear unchanged . The lungs are clear . There are no pleural effusions or pneumothorax . Mild relative elevation of the right hemidiaphragm compared to left appears unchanged . The osseous structures are unremarkable .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .