Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Streaky opacities in the lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are mild degenerative changes noted in the thoracic spine . Mild loss of height anteriorly of a vertebral body at the thoracolumbar junction is unchanged compared to ___ .
    OUTPUT:
    
Mild bibasilar atelectasis .