Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Postsurgical changes are again seen in the left upper lung and left lung base appearing similar to the prior exam . COPD is present with areas of scarring in the right upper lobe . No convincing signs of pneumonia , effusion or edema . No pneumothorax . Overall cardiomediastinal silhouette is stable . No bony injury .
    OUTPUT:
    
Stable postsurgical appearance of the left hemithorax . No evidence of pneumonia or overt CHF .