Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top - normal with stable cardiomediastinal and hilar contours . The aorta is tortuous with atherosclerotic mural calcifications . Bibasilar linear densities are unchanged from ___ and likely represent scarring given their chronicity . Lungs are otherwise clear without focal consolidation . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Stable bibasilar linear scarring without evidence of pneumonia .