Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with prior study , lung volumes are lower and increasing bibasilar opacities likely represent atelectasis . Allowing for differences in technique and positioning , cardiomediastinal silhouette is stable . There is no large effusion or pneumothorax . Crowding of the pulmonary vasculature with no overt pulmonary edema . Port - A - Cath with tip at the cavoatrial junction is unchanged .
    OUTPUT:
    
Lower lung volumes with increased bibasilar atelectasis , otherwise unchanged .