Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are similar compared to the prior study . Previous pattern of pulmonary edema has improved . Linear opacities within the lung bases likely reflect atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Bibasilar atelectasis . Previously noted pulmonary edema has nearly completely resolved .