Conclusion it is of important diagnostic value to use electronic bronchoscope to carry out lung biopsy for the diagnosis of peripheral lung cancer, which is safe and feasible, with few complication.

Objective to study the clinical value and differentiating various histologic type of lung cancer by using fiberoptic bronchoscope brushing cells in cytological diagnosis and histopathologic biopsy.

To explore the pathological and bronchoscopic characteristics of patients with asymptomatic lung cancer.