Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: IABP in place , 4 .7 cm below upper margin of aortic arch . It has been pulled back since prior exam . There is chronic left clavicle fracture . Lungs are clear . Normal heart size , pulmonary vascularity . Interstitial prominence has resolved since prior exam .
    OUTPUT:
    
IABP 4 .7 cm below upper margin of aortic arch .