Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . Allowing for differences in technique , the cardiac , mediastinal and hilar contours are probably unchanged . There is similar mild relative elevation of the left hemidiaphragm compared to the right . Although there are patchy opacities at the left lung base , these are not probably out of proportion to what could be expected with post-operative volume loss . It is difficult to exclude pleural effusions , particularly on the left . There is no pneumothorax .
    OUTPUT:
    
No definite findings to suggest acute cardiopulmonary disease . However , if there is persistent clinical concern for possible pneumonia , standard PA and lateral radiography may be helpful to assess the lungs with greater sensitivity for any possible infection .