Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph demonstrates marked rightward shift of cardiomediastinal structures due to known remote right lower lobectomy . Compared to ___ , there is increased opacification of residual right upper lung as well as left lower lung concerning for pneumonia . The right costophrenic angle is obscured from view ; however , this is unchanged compared to ___ and appears to represent the right heart , abutting the costophrenic angles , though on this single frontal view , an element of pleural effusion can not be excluded .
    OUTPUT:
    
Increased opacification residual right upper lung and left lower lung concerning for pneumonia .