Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild cardiomegaly , with prominence of the right heart border and possible prominence of the main pulmonary artery . Mild unfolding of the aorta . Azygous vein is top - normal in diameter . There is possible minimal upper zone redistribution , without other evidence of CHF . No focal infiltrate or effusion . The possibility of pericardial fluid can not be excluded on the basis of this exam .
    OUTPUT:
    
Mild cardiomegaly , detailed above . No overt CHF .