Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is moderate unchanged unfolding of the thoracic aorta . The main pulmonary artery and right hilum appear slightly prominent , probably due to mild enlargement of central pulmonary arteries , but without change . The lungs appear clear . There are no pleural effusions or pneumothorax . Moderate degenerative changes are noted along the lower thoracic spine including prominent anterior osteophyte formation along the lower thoracic vertebral body , increased since the remote prior study .
    OUTPUT:
    
No evidence of acute disease . Mildly prominent central pulmonary arteries although without change .