Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly tortuous . The mediastinal and hilar contours are otherwise within normal limits . The pulmonary vasculature is normal . Apart from subsegmental atelectasis in the lung bases , the lungs are clear . No pleural effusion or pneumothorax is present . No acute osseous abnormality is detected .
    OUTPUT:
    
No acute cardiopulmonary abnormality .