Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright AP radiograph of the chest . There is a small right pleural effusion and chronic scarring in the right infrahilar region . The left lung appears clear . The cardiomediastinal silhouette and hilar contours are stable . There is no pneumothorax . No new focal airspace opacity to suggest pneumonia .
    OUTPUT:
    
Small right pleural effusion . No convincing evidence of pneumonia .