Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is moderately enlarged . Aortic knob is densely calcified . The ascending aorta is dilated , but similar compared to the prior exams . Pulmonary vascularity is not engorged . The lungs are hyperinflated . Streaky bibasilar airspace opacities could reflect atelectasis . No pleural effusion or focal consolidation is noted . There is no pneumothorax . No acute osseous abnormalities are seen . Mild degenerative changes of the thoracic spine are present .
    OUTPUT:
    
Mild bibasilar atelectasis . Unchanged dilated ascending aorta .