Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A small quantity of free air can be seen under each hemidiaphragm . There is a small pleural effusion on the right . It is difficult to exclude a very small pleural effusion on the left side . The lungs appear clear . Bony structures appear within normal limits .
    OUTPUT:
    
Small quantities of air seen under each hemidiaphragm . This appearance could be seen with recent surgery but is not specific ; if symptoms persist , short - term follow - up radiographs may be helpful to ensure that free air decreases over time as it should after surgery .