Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear within normal limits . There are no pleural effusions or pneumothorax . Patchy opacity in the left costophrenic sulcus suggests minor atelectasis or scarring . Mild - to - moderate degenerative changes are present along the mid - to - lower thoracic spine .
    OUTPUT:
    
No evidence of injury .