Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is borderline enlarged . The mediastinal and hilar contours are within normal limits . Lung volumes are low . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . No acute osseous abnormalities seen .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process .