[Fibrobronchoscopy in lung cancer--an analysis of 560 cases]

560 cases of lung cancer were detected from 1100 cases examined by fibrobronchoscopy. 91.2% of these cases were diagnosed by histology or/and cytology. 71.9% were squamous cell carcinoma. The fibrobronchoscopy gave a positive detection rate of 89.8%, and in 51.1% of cases, it was able to see the tumor or the tumor with necrosis. The positive rate of the cellular brushings was 48%, and that of biopsy, 73.7%. The fibrobronchoscopy is most efficient in localizing the occult lung cancer (positive cytology but negative chest films). The false negative causes of the biopsy or cellular brushings are discussed.