Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . The heart is borderline in size . There is mild unfolding of the thoracic aorta . Patchy right infrahilar opacity suggests minor atelectasis . Otherwise , the lungs appear clear .
    OUTPUT:
    
Borderline cardiomegaly . No evidence of acute disease .