总结了１４７例经胸液细胞学确诊的恶性胸腔积液的临床资料。结果：原发肿瘤以肺癌、胃肠道肿瘤和乳癌为多，分别占５０３％、１３６％和９５％；胸液癌细胞中腺癌、鳞癌分别为７１４％和７５％；第一次胸液病理阳性率为６３９％，连续三次送检病理阳性率可达９３２％；胸液乳酸脱氢酶、癌胚抗原和胸液／血清乳酸脱氢酶比值、胸液／血清癌胚抗原比值阳性率较低，临床应用价值有限。 The clinical data of 147 cases of malignant pleural effusion confirmed by pleural fluid cytology were summarized. Results: The primary tumors were lung cancer, gastrointestinal cancer and breast cancer, accounting for 503%, 136% and 95%, respectively. The rates of adenocarcinoma and squamous cell carcinoma were 714% And 75% respectively. The positive rate of the first pleural effusion was 639% and the positive rate of pathology was 932% in three consecutive times. The positive rate of pleural fluid lactate dehydrogenase, carcinoembryonic antigen and pleural fluid / serum lactate Dehydrogenase ratio, low rate of pleural fluid / serum carcinoembryonic antigen ratio, limited clinical value.