Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear . Cardiomediastinal silhouette and hilar contours are unremarkable . No pleural effusion or pneumothorax is identified . The healing pathologic fracture of the known lytic lesion in the posterior aspect of the right sixth rib appears to have slightly increased callus formation on today 's exam .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .