Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . The mediastinal and hilar contours appear normal . Subtle airspace opacity projecting to the left lower lobe is present There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left lower lung consolidation may represent pneumonia in the appropriate clinical setting . Recommend followup imaging to ensure resolution .