Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . Increased opacity at the right lung base could reflect atelectasis in the setting of low lung volumes . Aspiration however can not be excluded . There is no definite pleural effusion or pneumothorax .
    OUTPUT:
    
Increased opacity at the right lung base could reflect atelectasis or aspiration .