Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . The lungs appear clear . Blunting of the posterior left costophrenic sulcus suggests a very small pleural effusion . A trace pleural effusion is difficult to exclude on the right . A catheter projects over the epigastrium .
    OUTPUT:
    
Trace suspected pleural effusion , at least on the left ; otherwise unremarkable .