Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The aortic arch is calcified . The contour of the aortopulmonary window is again prominent , reflecting enlargement of the main pulmonary artery as seen on the prior CT in addition to stability from the prior radiographs . The lungs appear clear . There are no pleural effusions or pneumothorax . Small - to - moderate osteophytes are noted along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease . Similar enlargement of central pulmonary arteries .