Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged . 3 endobronchial valves are re - demonstrated in unchanged position . Marked upper lobe predominant centrilobular emphysema is re - demonstrated . Linear opacities in lung bases likely reflect a combination of scarring and atelectasis . No pleural effusion , focal consolidation or pneumothorax is detected . There is no pulmonary edema . Multiple clips project over the left upper quadrant of the abdomen . There are no acute osseous abnormalities .
    OUTPUT:
    
Unchanged location of 3 endobronchial valves . Severe emphysema with bibasilar atelectasis and / or scarring .