肺癌在各种恶性肿瘤中病死率最高 ,且 5年生存率仅为13% ,平均生存期为 6个月。但如能进行早期诊断 ,积极治疗 ,可明显提高其生存率和延长生存时间[1] 。肺癌的临床表现复杂 ,误诊率高。有的报道误诊率高达 80 % [2 ] 。为减少误诊 ,我们对 1999年 1月～ 2 0 0 2年 3月住院 2 1 Lung cancer has the highest mortality among various malignancies with a 5-year survival of only 13% and an average survival of 6 months. However, if early diagnosis and aggressive treatment can significantly improve its survival rate and prolong survival time [1]. The clinical manifestations of lung cancer are complex and the rate of misdiagnosis is high. Some reports misdiagnosis rate as high as 80% [2]. To reduce misdiagnosis, we were hospitalized from January 1999 to March 2002,21