Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable chronic left apical pleural thickening . Lungs clear bilaterally without pleural effusion or pneumothorax . Heart is mildly enlarged in size with normal mediastinal contour and hila . Left lower lobe and retrocardiac opacity is likely from epicardial fat . Chronic stable biliary duct air was seen on CT . No bony abnormality .
    OUTPUT:
    
Left lower lobe opacity is likely epicardial fat . If clinical conern for pneumonia consider left anterior oblique for further assessment .