Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild advancement of the intra-aortic balloon pump to now 4 .8 cm below the apex of the aortic knob . Otherwise no significant interval change since chest radiograph performed earlier on the same day .
    OUTPUT:
    
IABP 4 .8 cm below apex of aortic knob , consider advancing 2 cm for standard positioning .