Abstract: Objective To explore the characteristics of lesions in lingular bronchus and right middle lobe for providing diagnosis evidences.Methods Retrospective analysis on the clinical,radiological,and bronchoscopic characteristics of the 161 cases with lingular segments lesions and 507 cases with right middle lobe lesions from a total of 5?286 cases examined by fiberoptic bronchoscopy.Results The ratio of the incidence between right middle lobe and lingular segment lesions was 3.1∶1.Out of these cases lingular bronchus with lingular bronchus lesions,the number of lung carcinoma patient was the top one.The lump image with cancer symptom only constitutes 34.4% of all lung cancers.Abnormality in the bronchial wall and bronchial cavity found by the fiberoptic bronchoscopy commonly resulted by lung cancers.Pneumonia occured frequently at right middle lobe.Abnormality in its bronchial all was commonly resulted by pneumonia,and abnormorlity in its bronchial cavity was mostly observed in lung cancer by fiberoptic bronchoscopy.Conclusion The typical signs of lung cancer in lingular segments are undefined by the chest radiography and fiberoptic bronchoscopy.Fiberoptic bronchoscopy examination would play important role in early diagnosis and identification diagnosis for the lingular segments and middle lobe lesions.

Key words: Fiberoptic bronchoscopy, Lingular segment, Right middle lobe, Lung cancer