Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is a possible subtle patchy left basilar opacity which seemed due to atelectasis , although infection or aspiration is not excluded in the appropriate clinical setting . The right lung is clear . There is no large pleural effusion or pneumothorax . Cardiac silhouette is mildly enlarged which may be accentuated by epicardial fat pad . No overt pulmonary edema is seen .
    OUTPUT:
    
Possible subtle patchy left basilar opacity could be due to atelectasis , although infection or aspiration is not excluded in the appropriate clinical setting .