Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Port - A - Cath terminates in the right atrium . There is a similar degree of right perihilar opacification but with a change in morphology , probably due to atelectasis . There is a small pleural effusion on the right , but no definite pleural effusion on the left , although the posterior costophrenic angle is difficult to assess .
    OUTPUT:
    
Small right pleural effusion .