Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is tortuous , unchanged and demonstrates diffuse atherosclerotic calcifications . Mediastinal and hilar contours are is similar . The pulmonary vasculature is normal . Streaky opacities in the lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .