Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Atherosclerotic calcifications are noted at the aortic knob . The mediastinal and hilar contours are within normal limits . Pulmonary vasculature is not engorged . Streaky linear opacities in the lung bases are most likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is appreciated . There are mild to moderate degenerative changes noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .