Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates persistent left upper lobe and right perihilar opacities , which are slightly improved as compared to the prior study . The cardiomediastinal and hilar contours are unchanged . A nasogastric tube ends in the stomach . The tip of the endotracheal tube is obscured by the overlying cervical collar . There is no pneumothorax , significant pleural effusion , or consolidation .
    OUTPUT:
    
Slight interval improvement in right perihilar and left upper lobe opacities .