胸腔积液(p leural effusion)是肺部及全身多种疾病的常见并发症,也是验证疾病病因、判断其良恶性的重要媒介[1]。胸腔积液治疗效果和预后关键在于其病因的判断,故对于胸腔积液到底是良性或恶性的鉴别是非常重要的。临床上引起胸腔积液的主要是结核性胸膜炎与恶性胸膜疾病,占所 P leural effusion is a common complication of various diseases in the lungs and the whole body. It is also an important medium for verifying the etiology of the disease and judging its benign and malignant diseases [1]. Pleural effusion treatment and prognosis of the key lies in the judgment of the etiology, so in the end is pleural effusion is benign or malignant identification is very important. Clinically cause pleural effusion is mainly tuberculous pleurisy and malignant pleural disease, accounting for