Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right IJ Swan - Ganz catheter is again seen . The tip lies more distal , compared with the film from 1 day earlier , now lying relatively distal over the right pulmonary artery , possibly at the origin of an inferior lobe vessel . No pneumothorax detected . Again seen is a left - sided pacemaker / tib - fib related type device , with 3 leads , unchanged . There is very slight upper zone redistribution , without other evidence of CHF . Again seen is cardiomegaly probably slightly improved . No focal infiltrate or effusion .
    OUTPUT:
    
1 . Interval advancement of the tip of the Swan - Ganz catheter . Clinical correlation regarding possible retraction requested . 2 . Probable interval decrease in size of cardiac silhouette , this appearance is also likely accentuated by differences in film technique . Minimal upper zone redistribution , without overt CHF .