Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is unchanged . The mediastinal and hilar contours are unremarkable . Minimal aortic knob calcifications are demonstrated . The pulmonary vascularity is not engorged . No focal consolidation , pleural effusion or pneumothorax is visualized . Minimal leftward deviation of the trachea at the thoracic inlet is likely due to a right thyroid goiter , as seen on the prior CT . There are mild atelectatic changes in the lung bases . Multilevel degenerative changes in the thoracic spine are noted .
    OUTPUT:
    
Mild bibasilar atelectasis .