Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are areas of bibasilar linear atelectasis . Patchy left base retrocardiac opacity most likely relates to atelectasis , although a superimposed early infectious process is not excluded . No large pleural effusion or pneumothorax is seen . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Bibasilar atelectasis . Additional patchy left basilar retrocardiac opacity most likely representing atelectasis , although infectious process is not excluded in the appropriate clinical setting .