Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild - to - moderately enlarged . Mitral annular calcifications are present . The aortic arch is calcified . The mediastinal and hilar contours appear stable . Streaky basilar opacities are probably due to atelectasis in the setting of low lung volumes . Otherwise , the lungs appear clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .