Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is subtle left basilar opacity which could be due to atelectasis ; however , infection process is not excluded in appropriate clinical setting . No pleural effusion or pneumothorax is seen . Cardiac and mediastinal silhouettes are unremarkable . No pulmonary edema .
    OUTPUT:
    
Subtle left basilar opacity may be due to atelectasis , but consolidation due to infection is not excluded in the appropriate clinical setting .