Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest . Previously seen moderate left pleural effusion has significantly decreased and there is now just a small left pleural effusion , adjacent atelectasis . Right lung is clear . No pneumothorax . Cardiomediastinal and hilar contours are normal . Left lower lobe atelectasis , reexpansion edema or pneumonia .
    OUTPUT:
    
Large left pleural effusion has now resolved with just small amount of left pleural fluid remaining . Adjacent opacity may represent reexpansion edema , pneumonia or atelectasis . Recommend attention on followup .