Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unchanged , with the aorta appearing mildly tortuous . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . No acute osseous abnormalities demonstrated . Degenerative changes of both acromioclavicular joints are noted .
    OUTPUT:
    
No acute cardiopulmonary abnormality .