Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are normal . The pulmonary vascularity is normal . 9 mm calcified structure projecting over the left eighth lateral rib is unchanged . Lungs are otherwise clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Ill - defined radioopacity projecting over the midline chest appears external to the patient , as it is not identified on the lateral view .
    OUTPUT:
    
No acute cardiopulmonary abnormality .