Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top - normal . Cardiomediastinal and hilar contours are normal . Lung volumes are low with associated atelectasis . Lungs are otherwise clear . Blunting of the left costophrenic angle suggests small left pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Small left pleural effusion . No evidence of pneumonia .