Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unremarkable except for mild atherosclerotic calcifications at the aortic arch . The pulmonary vascularity is not engorged . There is no focal consolidation , pleural effusion or pneumothorax . Linear opacities in the left lung base likely reflect subsegmental atelectasis . Multilevel degenerative changes in the thoracic spine are present . No acute osseous abnormalities are seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .