Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vascularity is normal . Linear opacities in the left mid lung field peripherally may reflect scarring or subsegmental atelectasis . Remainder of the lungs are clear . No pleural effusion or pneumothorax is present . No acute osseous abnormalities detected .
    OUTPUT:
    
No acute cardiopulmonary abnormality .