Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate asymmetric opacity at the left base , which may represent developing infectious process . Otherwise , the lungs are clear . The cardiac and mediastinal contours are normal . No pleural abnormality is detected .
    OUTPUT:
    
Subtle asymmetrical opacity at the left base may represent pneumonia in the appropriate clinical setting .