Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with chest radiograph obtained 1 day prior , bilateral lung opacities are improved . Persistent right perihilar opacities may be due to asymmetric pulmonary edema , possibly mitral regurgitation . Moderate cardiomegaly is unchanged . No pleural effusions or pneumothorax . The intra-aortic balloon pump has been withdrawn approximately 3 cm and is appropriately positioned . The patient has been intubated and the ET tube terminates approximately 3 .5 cm above the carina . Other support devices and lines are unchanged and appropriately positioned .
    OUTPUT:
    
Substantial improvement in bilateral parenchymal opacities . Persistent right perihilar opacities are likely asymmetric pulmonary edema .