Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains mildly tortuous with atherosclerotic calcifications again seen at the aortic knob . Hilar contours are unremarkable . Pulmonary vasculature is not engorged . Lungs remain hyperinflated . Linear opacities in the lung bases likely reflect areas of subsegmental atelectasis and / or scarring . No focal consolidation , pleural effusion or pneumothorax is detected . No acute osseous abnormalities seen .
    OUTPUT:
    
Bibasilar atelectasis / scarring without focal consolidation .