Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . The lungs appear clear . There are no pleural effusions or pneumothorax . A small to moderate quantity of free air is noted under each hemidiaphragm .
    OUTPUT:
    
Free intraperitoneal air . Findings discussed with Dr . ___ at 1 : 20 p .m . on ___ , at the time of interpretation by telephone .