Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Heterogeneous but focal opacification in the anterior left upper lobe suggests pneumonia . Elsewhere , the lungs appear clear . Bony structures are within normal limits .
    OUTPUT:
    
Findings consistent with left upper lobe pneumonia . Follow - up radiographs are recommended to show resolution within ___ weeks .