Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable including borderline cardiomegaly . Lung volumes are low with persistent mild relative elevation of the right hemidiaphragm . There is no definite pleural effusion or pneumothorax although posterior costophrenic sulci are somewhat difficult to assess on the lateral view . Allowing for technique , aside from mild atelectasis at the lung bases , the lungs appear clear . There is no evidence of free air .
    OUTPUT:
    
No definite acute cardiopulmonary disease . No free air identified .