Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs remain hyperinflated . Left base opacity is seen which is new since ___ , and which may be due to atelectasis , aspiration , or pneumonia . No pleural effusion is seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Hyperinflated lungs suggesting chronic obstructive pulmonary disease . . Left base opacity may be due to atelectasis , aspiration , or infection . Underlying scarring may also be present .