Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are exceedingly low , resulting in crowding of bronchovascular structures . Patchy opacity at the left lung base may reflect atelectasis or pneumonia . There is no pleural effusion or pneumothorax . Heart is normal size . Mediastinal hilar contours are unremarkable . Clips are seen overlying the thyroid bed .
    OUTPUT:
    
Patchy opacity at the left lung base could reflect pneumonia or atelectasis . Repeat examination with improved inspiratory effort could further clarify .