Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Apparent sclerotic focus is seen at the junction of the left first rib anteriorly and left third rib posteriorly , likely a bone island .
    OUTPUT:
    
No acute cardiopulmonary abnormality .