Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Redemonstrated is atelectasis seen within the left lung with associated left perihilar radiation changes and adjacent postobstructive changes . The left hemidiaphragm is elevated , likely secondary to fibrosis following radiation therapy . There is no focal consolidation seen within the right lung . There is no pleural effusion , pneumothorax , or overt pulmonary edema identified . The heart appears grossly normal in size .
    OUTPUT:
    
Left - sided atelectasis and perihilar radiation changes , without evidence of pneumothorax .