Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Sternotomy wires are noted . Linear opacities in the bilateral lower lobes likely represent bibasilar atelectasis versus scarring . There are atherosclerotic calcifications involving the aortic arch and descending thoracic aorta . No radiopaque cardiac valve is seen . S - shaped curvature of the thoracolumbar spine is noted .
    OUTPUT:
    
1 . No radio opaque cardiac valve is seen . 2 . Bibasilar atelectasis .