Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: IABP is located 6 cm below the apex of the aortic knob and may be advanced about 3 cm for standard positioning . Cardiac size appears enlarged but this may be exaggerated by technique and positioning . The lungs are clear . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
IABP is located 6 cm below the apex of the aortic knob and may be advanced about 3 cm for standard positioning .