Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac size is top normal . Low lung volumes exaggerate bibasilar atelectasis as well as the cardiac size . Patient is status post median sternotomy and CABG . There are no focal consolidations concerning for pneumonia . No large pleural effusions exist . There is no free air . There is no pneumothorax .
    OUTPUT:
    
No evidence of pneumonia given low lung volumes .