Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The inspiratory lung volumes are appropriate . There is a vague suggestion of a linear opacity at the left lower lung which could possibly represent pneumonia . Otherwise , the lungs are clear with no pleural effusion or pneumothorax . Cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Vague suggestion of a linear opacity at the left lower lung which , in the proper clinical scenario , could possibly represent pneumonia .