Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . The fact that the right cardiac border is mildly obscured suggests minimal opacification of the medial segment of the right middle lobe , not as well seen on the lateral view . The lungs appear otherwise clear .
    OUTPUT:
    
Minimal opacification of the right middle lobe suspected , commonly due to atelectasis . Comparison to prior radiographs may be helpful , if available .