Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ at 20 :19 , the radiopaque tip of the aortic balloon pump appears lies slightly higher , now projecting in the region of the aortic knob . Allowing for technical differences , the parenchymal findings are similar , possibly slightly worse . No effusions are identified . ET tube and NG tube are similar . The cardiomediastinal silhouette is probably unchanged .
    OUTPUT:
    
1 . Radiopaque portion of aortic balloon pump now lies slightly higher . Clinical correlation regarding retraction is requested . ( Most recent film from ___ at 08 : 15 shows that the radiopaque tip has been retracted ) . 2 . Diffuse alveolar opacities , with relative sparing of lung bases , are similar , possibly slightly worse .