Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . As seen on the prior examination from ___ is a subtle linear density along the lateral left chest at the base , which may represent a small pleural abnormality stable from ___ . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .