Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right pleural effusion is decreased compared to the immediate prior study of ___ . However , there is persistent opacification of the right lower lung field , corresponding to the right middle lobe on the lateral projection . Given the persistent rightward mediastinal shift , there is likely persistent right middle lobe collapse . The left lung is unremarkable . There is no pneumothorax . There is an age - indeterminate right posterior seventh rib fracture .
    OUTPUT:
    
1 . Persistent right middle lobe collapse . 2 . Interval decrease in right - sided pleural effusion . 3 . No pneumothorax .