Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild right infrahilar opacity which appears new since the prior study and likely reflects atelectasis although infection can not be completely excluded . The remaining lung fields are clear . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Minimal right infrahilar opacity is most likely atelectasis although infection is not completely excluded in the right clinical setting .