Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable . Surgical clips are seen projected over the left hemi thorax as before . A large subpulmonic left pleural effusion is again demonstrated and similar in extent to ___ . Opacity at the left base suggests compressive atelectasis . The right lung is clear . There is no pneumothorax . Postsurgical changes in the left hemi thorax are stable .
    OUTPUT:
    
Left pleural effusion / postsurgical change is stable from most recent prior exam . Subtle opacity involving the left lower lobe suggests passive atelectasis .