Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Density lateral to the aortic arch is most likely due to degenerative change at the ___ costochondral junction . Bibasilar opacities on the frontal view without correlates on lateral view most likely represent atelectasis . There is no effusion or pneumothorax . Heart size is top - normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
No acute cardiopulmonary process . Density lateral to the aortic arch is most likely due to degenerative change at the left ___ costochondral junction .