Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild blunting of the right costophrenic angle , which is suggestive of a trace effusion . Otherwise , the lungs appear clear . No confluent opacities are identified . There is no pulmonary edema . No pneumothorax is evident . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Possible trace right pleural effusion .