Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Linear opacity in the left lung base is compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No displaced fractures are seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .