Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated and clear . The cardiomediastinal silhouette and hilar contours are stable . There is no pleural effusion or pneumothorax . Again seen is a fracture of the left seventh rib posteriorly with callus formation . Degenerative changes are present throughout the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .