Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Aortic knob is calcified . Mediastinal and hilar contours are normal . Lungs are clear . No focal consolidation , pulmonary edema , pleural effusion or pneumothorax is present . Multilevel degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .