Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Linear opacities within the lung bases likely reflect areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar subsegmental atelectasis . Otherwise , no acute cardiopulmonary abnormality .