Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unchanged . Atherosclerotic calcifications are demonstrated at the aortic knob . Pulmonary vasculature is normal . Lungs are hyperinflated . Linear opacity in the left lower lobe likely reflects subsegmental atelectasis or scarring . No focal consolidation , pleural effusion or pneumothorax is seen . No acute osseous abnormalities demonstrated . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .