Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided pleural effusion has increased substantially and is now large with associated parenchymal opacification , not specific but compatible with atelectasis . There is no net shift of mediastinal structures . The left lung remains clear . There is no pneumothorax . Mild degenerative changes are similar along the thoracic spine . Cholecystectomy clips project over the right upper quadrant .
    OUTPUT:
    
Increasing right - sided pleural effusion .