Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged , with aorta appearing tortuous and diffusely calcified . The hilar contours are normal , and the pulmonary vasculature is not engorged . Blunting of the costophrenic angles posteriorly on the lateral view suggests trace bilateral pleural effusions . Minimal streaky opacities in the lung bases may also reflect atelectasis . There is no pneumothorax . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Trace bilateral pleural effusions . Mild bibasilar atelectasis .