Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . The aorta is minimally unfolded . There is mild bibasilar atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No pulmonary edema . Mild multilevel degenerative changes noted throughout the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .