Objective To assess the diagnostic value of lung ultrasonography( LUS) and clinical evaluation of the diagnosis of neonates with sudden pneumothorax by comparing the sensitivity and specificity of LUS,CXR and CTR on pneumothorax and establishing the regression model of clinical evaluation. Methods The clinical data of120 neonates with pneumothorax,all of whom received chest X-ray( CXR),chest transillumination( CTR) and LUS,were retrospectively analyzed. At the same time,another 120 newborns without pneumoth...