Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is substantial free air beneath the right hemidiaphragm . The lung volumes are low . The cardiac , mediastinal and hilar contours are unremarkable . Patchy basilar opacities seen on each side can probably be attributed to minor atelectasis . Otherwise , the lungs appear clear . There is no definite pleural effusion although small pleural effusions would be difficult to exclude , given technique . There is no pneumothorax .
    OUTPUT:
    
Moderate quantity of free air beneath the right hemidiaphragm . Findings discussed at 6 :45 with Dr . ___ by telephone very shortly after discovery .