Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base opacity is most likely due to atelectasis , but consolidation due to infection is not excluded in the appropriate clinical setting . No pleural effusion or pneumothorax is seen . Cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are unremarkable . No overt pulmonary edema is seen .
    OUTPUT:
    
Patchy left base opacity most likely due to atelectasis , but consolidation due to infection is not excluded in the appropriate clinical setting . No pulmonary edema .