胸腔积液是呼吸内科常见的临床病症 ,如何鉴别胸水的良恶性是临床医师经常遇到的问题。本文对 1996～ 1998年在我院住院治疗的 12 0例胸腔积液患者的临床资料 ,结合实验室检查 ,进行回顾性分析 ,探讨良恶性胸水各自的临床及实验室特点 ,现总结如下。1　临床资料1.1　一般资料　 Pleural effusion is a common respiratory disease clinical symptoms, how to identify benign and malignant pleural effusion is a clinician often encountered problems. This article from 1996 to 1998 in our hospital for treatment of 120 cases of pleural effusion in patients with clinical data, combined with laboratory tests, a retrospective analysis of benign and malignant pleural effusion to explore their respective clinical and laboratory characteristics, are summarized below. 1 clinical data 1.1 general information