Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Left - sided Port - A - Cath tip terminates at the cavoatrial junction . Cardiac and mediastinal contours are within normal limits . Streaky opacities within the lung bases bilaterally appear more progressed from the prior study , and likely reflect atelectasis . Infection , particularly in the left lung base , can not be completely excluded . Small left pleural effusion appears not significantly changed in the interval . There is no pneumothorax . Multiple clips are demonstrated within the upper abdomen .
    OUTPUT:
    
Persistent small left pleural effusion . Worsening bibasilar airspace opacities , likely reflecting atelectasis though infection within the left lung base can not be completely excluded .