Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size , mediastinal , and hilar contours are normal . The lungs are clear without pleural effusion , focal consolidation , or pneumothorax . Bony callus about a deformity of the mid left seventh posterior rib is new since the chest radiograph from ___ , but does not appear acute .
    OUTPUT:
    
No evidence of pneumonia . Bony deformity of the left seventh posterior rib does appears chronic .