Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Swan - Ganz catheter placed from a femoral approach is slightly less deep into the left main pulmonary artery with other supporting catheters in unchanged positions . There is some improvement in the aeration in the upper zones with less prominent air bronchograms and increase lucency .
    OUTPUT:
    
Slight interval improvement in aeration upper lobes bilaterally .