Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and two lateral views of the chest were viewed . The cardiomediastinal and hilar contours are unchanged . There is no pleural effusion or pneumothorax . Bibasilar opacities may reflect atelectasis or aspiration .
    OUTPUT:
    
Bibasilar opacities , which may reflect atelectasis or aspiration .