Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tip of the intra-aortic balloon pump projects 1 .7 cm below the aortic knob apex , unchanged but higher than usual . Heart size is normal and the lungs are clear without pleural effusion , focal consolidation or pneumothorax .
    OUTPUT:
    
The tip of the intra-aortic balloon pump is higher than usual , projecting 1 .7 cm below the aortic knob apex .