Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . A faint left lower lobe opacity is small at the site of prior pneumonia . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Small left lower lobe opacity may reflect scarring from previous pneumonia . This should be followed up by repeat radiograph in about 6 months . 2 . No definite evidence of active pneumonia . Updated results were telephoned to Dr . ___ by ___ at 9 :00 am , ___ , 30 minutes after discovery .