Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Atelectatic changes are seen in the lung bases . No focal consolidation or pneumothorax is seen . Minimal blunting of the costophrenic angles posteriorly indications trace pleural effusions , better seen on the prior CT .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis . Trace bilateral pleural effusions .