Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hazy opacity at the right lung base may represent atelectasis . However , differential would include a small contusion or infection in the appropriate clinical setting . No other consolidation . No pleural effusion or pneumothorax . Cardiomediastinal contours are normal . No acute osseous abnormalities . No subdiaphragmatic free air .
    OUTPUT:
    
Hazy opacity at the right lung base may represent atelectasis or a small contusion .