Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . The aorta is mildly tortuous . The pulmonary vascularity is normal . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is visualized . Left humeral head prosthesis is noted , and there are extensive degenerative changes within the right glenohumeral joint . No displaced rib fractures are noted . Multilevel degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No displaced rib fractures noted . If there is continued clinical concern , dedicated rib series is recommended .