Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . The aorta remains tortuous but unchanged . Minimal leftward deviation of the trachea is attributable to known multinodular thyroid goiter . The hilar contours are normal , and the pulmonary vascularity is not engorged . Except for subsegmental atelectasis in the lung bases , the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There are mild degenerative changes of the thoracic spine .
    OUTPUT:
    
Mild bibasilar subsegmental atelectasis . No congestive heart failure .