Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged with similar mild prominent of the main pulmonary artery contour . There is no pleural effusion or pneumothorax . Mild prominence of central interstitial opacities appears , if anything , decreased .
    OUTPUT:
    
No evidence of acute disease . Similar mild prominence of the aortopulmonary window , possibly due to mild pulmonary artery enlargement .