Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . The pulmonary vascularity is normal . A linear opacity within the right lung base likely reflects subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . Several old left - sided rib fractures are present . No acute osseous abnormality is seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .