Fei Q, et al. - In this systematic review and meta-analysis, researchers compared the diagnostic accuracy of lung ultrasound against chest X-ray in neonates with pneumothorax. For prospective studies on the diagnostic accuracy of lung ultrasound in neonates with pneumothorax, they explored the Chinese journal full-text database, Wanfang database, China biomedical document service system, Weipu Chinese science and technology periodical full-text database, EMBASE, PubMed, The Cochrane Library and Web of Science (up to January 2020). In diagnosing pneumothorax, lung ultrasound had better sensitivity and specificity than a chest X-ray. There was a high sensitivity in the diagnosis of some ultrasonic signs (absence of lung sliding or B-lines) that could be used to diagnose pneumothorax. The lung point can help to assess the severity of pneumothorax. Its presence means that pneumothorax is mild to moderate; pneumothorax is severe otherwise.