Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a persistent moderately large left pleural effusion with associated atelectasis . Infection can not be excluded . The right lung and left upper lung are grossly clear . A right - sided Port - A - Cath terminates in the distal SVC or right atrium , the tip is difficult to visualize . No pneumothorax seen .
    OUTPUT:
    
No significant interval change when compared to the prior study .