Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The cardiac , mediastinal and hilar contours appear stable . Streaky opacities at the left lung base suggests minor atelectasis . Trace pleural effusions are suspected bilaterally . There is a small quantity of free air beneath the left hemidiaphragm although not necessarily significant in the early post-operative course .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . Small quantity of free air .