胸腔积液（以下简称胸水）临床常见，病因多样，有时在鉴别其良恶性时存在困难，我们自１９９５年１月至１９９７年２月间对７６例胸水患者用ＰＰＤ（结核菌纯蛋白衍化物）试验，现就不同性质胸水患者的反应结果加以分析，探讨临床应用价值。对象和方法１．病例选择和分组... Pleural effusion (hereinafter referred to as pleural effusion) is clinically common and has a variety of causes. Sometimes it is difficult to identify benign and malignant diseases. We used PPD (Mycobacterium tuberculosis pure protein derivative) in 76 patients with pleural effusion from January 1995 to February 1997. Experiments are now being conducted to analyze the response results of patients with different types of pleural effusion and explore the clinical application value. Objects and Methods 1. Case selection and grouping...