Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hyperexpanded consistent with emphysematous changes . No focal consolidations concerning for pneumonia are present . Streaky opacity at the left lung base is likely atelectasis versus scaring . Cardiomediastinal silhouette and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .