Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate clear , well - expanded lungs without pleural effusion or pneumothorax . Scarring in the left costophrenic angle is unchanged from ___ years prior . The pulmonary vasculature is normal . The cardiac silhouette is normal in size , the mediastinal contours are normal .
    OUTPUT:
    
No acute chest abnormality .