Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes with resulting bronchovascular crowding . There is an area of increased opacification at the right base , which likely represents a small pleural effusion with adjacent atelectasis , but superimposed infection can not be excluded . The left lung is clear . The cardiomediastinal and hilar contours are unchanged . A right - sided internal jugular central venous line ends at the cavoatrial junction . A left - sided internal jugular central venous line ends at the upper - to - mid SVC . Nasogastric tube courses into the stomach and out of field of view .
    OUTPUT:
    
Area of increased opacification at the right base likely represents a small pleural effusion with adjacent atelectasis , but superimposed infection can not be excluded .