Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle opacity at the left lower lung may be due to atelectasis , however , early consolidation due to infection or aspiration is not excluded . No pulmonary edema is seen . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Subtle left lower lung opacity was likely due to atelectasis or scarring , however , early consolidation due to infection or aspiration is not excluded in the appropriate clinical setting .