Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unchanged with mild unfolding of the thoracic aorta noted . The pulmonary vascularity is normal . Minimal subsegmental retrocardiac atelectasis is noted . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities are visualized .
    OUTPUT:
    
No acute cardiopulmonary abnormality .