肺癌是全世界发病率和病死率最高的癌症,其确诊需依靠痰细胞学检查、纤维支气管镜(纤支镜)检查、经皮肺穿刺活检、纵膈镜检查及对可疑转移病灶的活检等手段。其中纤支镜检查既可直接观察到气管和支气管中的病变,又可获取组织病理学和细胞学诊断,是肺癌确诊的最主要手段之一[1]。周围型肺癌是指发生于段支气管(三级)以下的肺癌,早期体积小,与中心型肺癌相比呼吸道症状不明显,其纤支镜镜下特征以间接征象远较直接征象多见,占 Lung cancer is the world’s highest incidence and mortality of cancer, the diagnosis depends on sputum cytology, bronchoscopy (bronchoscopy), percutaneous lung biopsy, mediastinal examination and the suspicious metastasis lesions biopsy means. Fiberoptic bronchoscopy which can be directly observed in the trachea and bronchial lesions, but also to obtain histopathological and cytological diagnosis is one of the most important means of lung cancer diagnosis [1]. Peripheral lung cancer refers to the lung cancer that occurs in the segment of the bronchus (grade 3), has a small size in the early stage, and has no obvious respiratory symptoms compared with the central lung cancer. The indirect signs of bronchoscopy are more common than the direct signs