大量胸腔积液一般较易诊断,而肋膈角处的少量积液则易漏诊。后前立位胸透时,后肋膈角位置最低,积液最早积聚于此,在常规胸透时往往不易发现。所以,在检查是否有少量胸腔积液时,应采取适当体位,使肋膈角能够清楚地显示于光屏上,以便发现其微小改变。如果肋膈角较正常人钝,则可判断该处已发生病变。但是由于少量积液和胸膜粘连均能使肋膈角发生这种变化,所 A large number of pleural effusion is generally easier to diagnose, and a small amount of effusion at costophrenic angle is easy to miss. Posterior chest thoracentesis, the lowest position after the costophrenic diaphragm, the earliest accumulation of fluid in this, often not easy to find in the conventional chest through. Therefore, in checking whether there is a small amount of pleural effusion, should take the appropriate position, the costophrenic angle can be clearly displayed on the light screen, in order to find its slight changes. If the costophrenic angle than the normal dull, you can determine where lesions have occurred. However, due to a small amount of effusion and pleural adhesions can make the costophrenic angle of this change