Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior radiograph , the right upper extremity PICC line has slightly migrated proximally , terminating just below the expected location of the cavoatrial junction . Bilateral perihilar atelectasis is slightly improved since the prior study . No pleural effusion or pneumothorax . Heart size is normal and lungs are essentially clear .
    OUTPUT:
    
Right - sided PICC line terminates just below the cavoatrial junction , slightly retracted from the prior study .