Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes which results in bronchovascular crowding . Moderate left - sided pleural effusion with bibasilar atelectasis is not significantly changed over the interval . Slight interval improvement in aeration of the upper lungs bilaterally . The cardiomediastinal and hilar contours are unchanged . The tip of the Swan - Ganz catheter placed from a femoral approach ends in the region of the left main pulmonary artery . Endotracheal tube ends 5 cm from the carina . Nasogastric tube courses into the stomach and out of the field of view . No pneumothorax .
    OUTPUT:
    
Moderate left - sided pleural effusion with bibasilar atelectasis is not significantly changed over the interval . Slight interval improvement in aeration of the upper lungs bilaterally .