目的　探讨99mTc 平阳霉素 (PYM)肺显像诊断原发性肺癌的临床价值。方法　对 5 6例原发性肺肿瘤患者行PYM肺显像。结果　肺癌与肺良性病变对 99m　Tc PYM的摄取差异有显著性 ,以晚期摄取比值作为诊断肺恶性病变的阈值 ,其诊断的准确性、灵敏度及特异性分别为 82 .1%、82 .7%和 80 .0 %。以储留指数为阈值 ,则分别为 94 .6 %、93.0 %和 10 0 .0 %。肺癌不同组织学类型之间摄取差异无显著性。结论　99mTc PYM对肺癌的鉴别诊断有一定临床价值 Objective To investigate the clinical value of 99mTc pingyangmycin (PYM) lung imaging in the diagnosis of primary lung cancer. Methods PYM lung imaging was performed in 56 patients with primary lung cancer. Results The uptake of 99m Tc PYM was significantly different between lung cancer and benign pulmonary lesion. The accuracy of the diagnosis, sensitivity and specificity were 82.1%, 82.7% And 80 .0%. The storage index as the threshold, respectively, 94.6%, 93.0% and 100%. There was no significant difference between different histological types of lung cancer. Conclusion 99mTc PYM has certain clinical value in the differential diagnosis of lung cancer