Fig. 7

MV is often used for severe pneumothorax. LUS showed clear presence of pleural line and A-line on B-mode image (A) and a stratospheric sign on M-mode (B), lung sliding disappeared under real-time ultrasound scanning, while there are no spared area and lung point in the entire lung field. Which was consistent with the ultrasound imaging characteristics of severe pneumothorax. In most cases, the infants with severe pneumothorax need for invasive high-frequency oscillatory ventilation treatment