Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs show the lungs to be well expanded and clear . The pleural surfaces are normal . A trace amount of intraperitoneal free air is seen below the right hemidiaphragm in this post-operative patient . The mediastinal contours and cardiac silhouettes are normal .
    OUTPUT:
    
No acute chest abnormality , with trace post-operative intraperitoneal free air .