Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged with mild tortuosity of the thoracic aorta again noted . There is diffuse calcification of the aorta . The pulmonary vascularity is not engorged . Streaky opacity in the left lung base likely reflects atelectasis . There is mild elevation of the left hemidiaphragm . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild atelectasis in the left lung base . Chronic elevation of the left hemidiaphragm .