Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable other than the presence of atherosclerotic calcifications at the aortic knob . Lungs are hyperinflated but clear without focal consolidation . No pleural effusion or pneumothorax is present . Pulmonary vasculature is normal . There are mild degenerative changes within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .