Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is left lung volume loss secondary to prior upper lobectomy , further denoted by suture material and surgical clips . There is a left upper zone opacity since ___ which may reflect pneumonia or post-radiation change . The right lung remains clear . There is no pneumothorax .
    OUTPUT:
    
New left upper zone opacity which may reflect pneumonia or post-radiation change .