Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right internal jugular catheter terminates in the distal SVC . Platelike atelectasis in the right lung base . There has been interval improvement in aeration of the left lung base with reduced atelectasis and likely a small residual effusion . No pneumothorax seen . Previous median sternotomy and coronary artery bypass clips seen .
    OUTPUT:
    
Interval decrease in the degree of atelectasis of the left lung base . Probable small residual left pleural effusion .