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胸腔积液在临床上极为常见。中等量以上典型胸腔积液的Ｘ线诊断并不难，少量积液则容易被漏诊或误诊。本文报道２６例少量胸腔积液的Ｘ线诊断，并着重讨论侧卧水平位在其诊断中的价值。１ 资料和方法少量胸腔积液是相对于中等量以上积液而言。临床上要做定量诊断是不实际的。
Pleural effusion is extremely common in clinical practice. Moderate amount of more than typical chest X-ray diagnosis is not difficult, a small amount of fluid is easily missed or misdiagnosed. This article reports the diagnosis of a small amount of pleural effusion in 26 cases and focuses on the value of the horizontal position in diagnosis. 1 Materials and Methods A small amount of pleural effusion is relative to medium amount of fluid above terms. To do quantitative diagnosis clinically is not practical.