Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a large pleural effusion , with likely a loculated component on the right , with compressive atelectasis of major portions of the right lower and middle lobes . There is no pneumothorax . The left lung is well expanded and clear . The cardiac size is within normal limits . The hilar and mediastinal contours are normal .
    OUTPUT:
    
Large right pleural effusion again seen , stable to slightly increased , likely loculated , with compressive atelectasis of major portions of the right middle and lower lobes . If the cause of the pleural effusion has not been established , recommended a CT of the chest with contrast , after thoracentesis to rule out an underlying mass .