肺原发性肉瘤罕见，巨大肺肉瘤非常罕见，我院见１例误诊为大量胸腔积液，现报告如下。患者｀，女，３７岁，胸闷气逼１月。Ｔ３８℃、Ｐ１１０次／分、Ｒ２２次／分、ＢＰ１４／１１ｋＰａ。化验：ＲＢＣ４５３×１０／Ｌ、ＷＢＣ３９．６×１０９／Ｌ。在外院诊断为：结核性? Pulmonary primary sarcoma is rare. Giant lung sarcoma is very rare. In our hospital, one case was misdiagnosed as a large number of pleural effusions. The report is as follows. Patient `, female, 37 years old, chest tightness forced in January. T38°C, P110 beats/minute, R22 beats/minute, BP14/11kPa. Laboratory tests: RBC453×10/L, WBC 39.6×109/L. In the external hospital diagnosis: tuberculosis?