观察肺癌胸膜转移的胸膜及胸水病理超微结构改变，以提高临床诊断率。方法通过对１４例疑为肺癌胸膜转移的患者分别进行胸膜、胸水的病理超微结构的观察。结果电镜超微结构对肺癌胸膜转移的肯定诊断明显优于光镜的病理检查。结论此方法结合胸膜活检对肺癌胸膜转移的诊断快速、简便、并发症少，可为临床推广。 Observe pathological ultrastructural changes in pleural and pleural effusions of lung cancer with pleural metastasis to improve clinical diagnosis. Methods The pathological ultrastructure of pleural effusion and pleural effusion was observed in 14 patients with suspected pleural metastasis of lung cancer. Results The positive diagnosis of pleural metastasis of lung cancer was obviously superior to that of light microscopy. Conclusion This method combined with pleural biopsy for the diagnosis of pleural metastasis of lung cancer is rapid, simple, and has few complications. It can be clinically popularized.