Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are within normal limits . The pulmonary vasculature is not engorged . Linear opacities within the lung bases bilaterally are compatible with areas of subsegmental atelectasis . Remainder of the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild subsegmental bibasilar atelectasis . No evidence for congestive heart failure .