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 a focal consolidation projecting over the left lung within the lingula . Elsewhere , the lungs appear clear . There is a suspected trace pleural effusion on the left only . There is no pneumothorax . The osseous structures are unremarkable .
    OUTPUT:
    
Opacity suggesting pneumonia in the lingula . Follow - up radiographs are recommended within eight weeks in order to ensure resolution .