Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased opacification over the lower thoracic spine on the lateral radiograph may represent lower lobe atelectasis ; however , a developing pneumonia can not be excluded in the appropriate clinical setting . Horizontal linear opacities in the bilateral lung bases are consistent with plate - like atelectasis . The inspiratory lung volumes are decreased . No pleural effusion or pneumothorax is detected . The cardiac silhouette is normal is size and unchanged . The thoracic aorta is tortuous throughout its course . The mediastinal and hilar contours are within normal limits and stable .
    OUTPUT:
    
Probable bibasilar atelectasis though in the appropriate clinical setting a developing pneumonia can not be excluded .