RESUMEN
Objective To improve the knowledge and diagnostic ability of imagiology of NRDS.Methods The clinical data and X-ray features in 20 cases with NRDS who had complete materials were analysed.Results According to X-ray manifestations all cases were divided into four stages:Ⅰ stage(n=3),Ⅱ stage (n=5),Ⅲ stage (n=8) and Ⅳ stage (n=4).Of them,three cases were in company with aspiration pneumonia,four cases with infective pneumonia,five cases with air leak and two cases with intra-alveolar hemorrhage.Typical X-ray features included:the pulmonary lucency decreased,wide-ranging net and grain shadowes of high density,and in companing with a lot of air bronchus sign.Conclusion X-ray plain film,especially computed radiography is the most important imaging method in diagnosis of NRDS.