Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unremarkable except for mild tortuosity of the thoracic aorta . The pulmonary vasculature is not engorged . Linear opacities within the left lung base likely reflects subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities detected .
    OUTPUT:
    
No acute cardiopulmonary abnormality .