Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly improved compared to the prior study . A left - sided PICC terminates in the distal SVC . The cardiomediastinal contour is unchanged . There is improved aeration at the right lung base with resolution of the silhouetting of the right hemidiaphragm . No new areas of consolidation seen . No pneumothorax seen . A tracheostomy is in - situ .
    OUTPUT:
    
Slight interval improvement in the aeration of the right lung base .