Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The aortic knob is calcified . The mediastinal and hilar contours are unremarkable . Linear opacities in the right mid lung field and left lung base are compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . There are multilevel degenerative changes noted within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .