Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Blunting of the posterior costophrenic sulcus could reflect a small effusion . The heart is normal in size with normal cardiomediastinal contours . Free air seen under the right hemidiaphragm but is compatible with the patient 's cholecystectomy from one day prior .
    OUTPUT:
    
No acute intrathoracic process with free intraperitoneal air compatible with recent surgery .