Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal contours are unchanged with minimal tortuosity of the thoracic aorta . There are mild aortic calcifications . The pulmonary vascularity is not engorged . Linear opacities within the left lower lobe are compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . DISH is seen within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Subsegmental atelectasis in the left lower lobe .