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 . There is a large left - sided pneumothorax , without evidence of tension . A left - sided pleural drainage catheter is in place , in unchanged position . Cardiomediastinal and hilar contours are unchanged . The aorta is tortuous .
    OUTPUT:
    
Large left - sided pneumothorax , without evidence of tension .