Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no significant interval change in the small right apical pneumothorax . Overall , there appears to be slight interval increase in the opacity overlying the right hemithorax . Remainder of the lungs appear stable .
    OUTPUT:
    
1 . No significant interval change in the small right apical pneumothorax . 2 . Interval increase in right perihilar opacification due to atelectasis or pneumonia .