Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The chest is hyperinflated . The lungs appear clear . Vague sclerosis projects along the anterior aspect of the left third , fourth and sixth ribs , possibly due to interval nondisplaced fractures although not necessarily acute .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Possible nondisplaced rib fractures on the left although not necessarily acute .