Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top - normal . Thoracic aorta is mildly unfolded with aortic knob calcifications . Hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax . Comminuted , angulated fracture of the distal thirds of the left clavicle demonstrates increasing bony callus formation . No obvious acute rib fracture is noted . Old left lateral rib fractures noted .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormality . 2 . Healing comminuted left distal clavicle fracture .