Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . The lungs are clear and the pulmonary vascularity is normal . No focal consolidation or pneumothorax is seen . Minimal blunting of the left costophrenic sulcus posteriorly appears chronic and may reflect pleural thickening rather than pleural fluid . There is no acute osseous abnormality identified . Degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .