Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . A linear opacity overlying the right third anterior rib is unchanged since the prior study and a small dense nodular opacity overlying the left third anterior rib is also unchanged . It is uncertain whether these represent sclerotic benign bone island on the ribs or focal scarring and calcified granuloma in the upper lobes of the lungs , respectively . In either case , these are benign findings requiring no further evaluation . No new areas of opacity are identified within the lungs , and there are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Stable radiographic appearance of the chest with no evidence of pneumonia .