Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Linear and streaky opacities are seen at the lung bases most likely reflective of atelectasis . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar atelectasis . Otherwise , no acute cardiopulmonary abnormality .