Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Lungs are hyperinflated suggestive of COPD . Ill - defined patchy opacity within the retrocardiac region is concerning for pneumonia in the correct clinical setting . Previously noted right infrahilar patchy opacity appears improved . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Patchy ill - defined opacity in the left lower lobe is concerning for pneumonia in the correct clinical setting . 2 . Previously demonstrated right infrahilar opacity appears resolved . 3 . Lung hyperinflation suggestive of COPD .