Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are unchanged . Bilateral paramediastinal changes are again seen . Bilateral low lung volumes . Improved appearance of right lung base with loss opacification . Otherwise no significant interval changes compared to ___ . There is no pneumothorax or pleural effusion . Lines and tubes in expected and unchanged positions . Partially visualized VP shunt again seen .
    OUTPUT:
    
No significant changes compared to ___ . Possible decreased opacification of right lung base .