Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , new opacities are seen in the right perihilar region , possibly reflecting radiation treatment changes and mild right adjacent atelectasis . Concurrent pneumonia can not be excluded in the appropriate clinical setting . Even given CT Chest from ___ , direct comparison is difficult . Mild retrocardiac atelectasis is noted . The left lung is clear . The heart size is mildly enlarged . No pneumothorax or pleural effusion .
    OUTPUT:
    
1 . New opacities seen in the right perihilar region may reflect radiation treatment changes and adjacent atelectasis , although concurrent pneumonia can not be excluded in the right clinical setting .