Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Aorta is mildly tortuous but unchanged . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Linear opacities in the left lung base reflect areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormality is detected .
    OUTPUT:
    
No acute cardiopulmonary abnormality .