Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is no pneumonia . 4 - mm left upper lobe nodule described on the chest CT is not visible on this chest x-ray . Mediastinal and cardiac contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . There is no evidence of pneumonia . 2 . 4 - mm left upper lobe nodule described on recent CT can not be assessed on this chest x-ray .