Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The intra-aortic balloon pump tip projects 5 .1 cm below the aortic knob apex , previously 3 .5 cm below . Constant positioning of the left Swan - Ganz catheter and left pacemaker leads . No new focal consolidation concerning for pneumonia . No evidence of pulmonary edema or effusions . Mild cardiomegaly is unchanged .
    OUTPUT:
    
The intra-aortic balloon pump tip projects 5 .1 cm below the aortic knob apex , previously 3 .5 cm below . It should be inserted further for optimal positioning .