Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is mild bibasilar atelectasis . Patchy left base retrocardiac opacity could be due to atelectasis than early pneumonia . The cardiac and mediastinal silhouettes are stable . No overt pulmonary edema is seen .
    OUTPUT:
    
Bibasilar atelectasis . Left retrocardiac opacity more likely to be atelectasis versus less likely pneumonia .