胸腔积液是在病理状态下由于胸膜壁层毛细血管体液渗出与胸膜脏层毛细血管和淋巴管的再吸收之间的动态平衡失调而产生。为比较不同病因引致胸腔积液患者的Ｔ淋巴细胞亚群分布水平及对原发病的诊断价值 ,选择肿瘤性、结核性、其它病因等胸腔积液患者的胸水和外周血液进行Ｔ淋巴 Pleural effusion in the pathological state of the pleural wall capillaries due to fluid leakage and pleural visceral capillaries and lymphatic reabsorption between the imbalance arising from. In order to compare the distribution of T lymphocyte subsets in patients with pleural effusion caused by different causes and the diagnostic value of T lymphocyte subsets, select pleural effusion and peripheral blood of patients with pleural effusion such as neoplasm, tuberculosis and other etiologies,