The results show sa follows: middle - aged patients were more common in this group 56%. the neoplasms were situated in the lobular bronch 76. 8%, right lung 55. 3% and left lung 41. 4% and trachea carina carcinoma 3. 3%.

• 本组病例以中年人多见56%25；肿瘤多位于叶支气管76.；8%25；右肺55