Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The a small left pleural effusion with associated compressive atelectasis is unchanged compared with the immediate prior study of ___ . A superimposed left lower lobe pneumonia is possible in the proper clinical setting . There is no pneumothorax or pulmonary edema . The heart size is top normal .
    OUTPUT:
    
Stable small left pleural effusion with associated compressive atelectasis . Superimposed left lower lobe pneumonia is possible in the proper clinical setting .