The Comparison of EBUS-TBNA, TBMC Via a Tunnel, and TBFB Via a Tunnel in Diagnosing Mediastinal Lymphadenopathy.

Inclusion Criteria: * Age ≥ 18 years; * At least 1 hilar/mediastinal lesion (short axis ≥ 1 cm) requiring diagnostic bronchoscopy procedure; * Patients who can understand the purpose of the trial, participate voluntarily and sign an informed consent form. Exclusion Criteria: * The lesion is a mediastinal cyst or abscess; * Combined severe cardiopulmonary diseases, coagulation disorders, poor tolerance to anaesthesia, combined psychiatric disorders or severe neurosis and other relevant contraindications to bronchoscopy; * EBUS assessment reveals that the lesion is rich in blood flow or adjacent to a large vessel, etc. Consider biopsy to be high risk and inappropriate for continuation of biopsy; * EBUS did not detect lesions in the hilum and/or mediastinum; * Those who, in the judgement of the investigator, have poor patient compliance and are unable to complete the study as required due to mental disorders, etc.