Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Known displaced right posterior eleventh and twelfth rib fractures and a known right posterior nondisplaced rib fracture are not appreciated on this examination . The lung fields are clear . Cardiomegaly is mild .
    OUTPUT:
    
Known displaced right posterior eleventh and twelfth rib fractures and a known right posterior nondisplaced rib fracture are not appreciated on this examination . Lung fields are clear .