AJCC=American Joint Committee forward Cancer; ATS=American Thoracic Society; PCNA=percutaneous needle aspiration; TBNA=transbronchial needle aspiration Since the unravelling of the techniques of comput tomographic (CT) scanning and transbronchial needle aspiration.

AJCC=American Joint Committee forward Cancer; ATS=American Thoracic Society; PCNA=percutaneous needle aspiration; TBNA=transbronchial needle aspiration

Since the unravelling of the techniques of comput tomographic (CT) scanning and transbronchial needle aspiration, the staging of bronchogenic carcinoma has changed. Previous staging, mainly at plain chest x-ray films and surgery was discloseed by the American joint Committee upon Cancer (AJCC) and has been used since the early 1970s[12] The present modification of the AJCC rule is designed to reflect fresh philosophies of treatment and to analyze differences between the AJCC hypothesis and the system of the Union Internationale Contrele Cancer (UICC) (widely used in Europe) and of the Japan Joint Committee of Lung Cancer; this modification has provided the opportunity for progression to an international unified system[3-7] This report is intended to stimulate the disclosure of an international system of bronchoscopic staging and to incorporate that regularity into the new AJCC system

In the past, bronchoscopy played a limited part in the staging of bronchogenic carcinoma, and the major use of bronchoscopy was to assess the T (tumor) status. Lesions beyond the lobar bronchus were considered as T1; tumors involving the main bronchus 2 cm or more distal to the carina were considered as T2; tumors in the main bronchus within the 2-cm distance from the carina, further without involvement of the carina, were considered T3; and, finally, tumors invading the carina were considered as T4 progressive growth of the CT scan has expanded the part of the radiologist in the staging of bronchogenic carcinoma, compared with the limited use and value of routine plain chest x-ray film and tomography. Numerous reports have been published about the staging of lung cancer through CT scan, in particular about its usefulness in evaluating the nodal status.[8-10] The general conclusion is that the CT scan, when used to evaluate the mediastinum, is same sensitive, but not too specific. The value of flexible bronchoscopic techniques of transbronchial needle aspiration (TBNA) in staging bronchogenic carcinoma has also been reported. In general, transbronchial needle aspiration is sensitive and specific for the diagnosis of lymph node involvement.[10-12] The combined use of these couple relatively new techniques, the CT scan and TBNA, has provided us with a great opportunity for noninvasive staging of bronchogenic carcinoma. As previously stated, bronchoscopy without TBNA has solitary limited merit in evaluating the intrabronchial size of the tumor and has no part f or evaluating the lymph nodal status. Therefore, the use of bronchoscopy is limited mainly to evaluation and diagnosis of the airway.

The evolution of the TBNA technique has markedly expanded the part of bronchoscopy from diagnosis to staging. The ability of TBNA to sample the mediastinum and hilar lymph nodes potentially can attenuate the need for mediastinoscopy for right paratracheal lesions, the ne for mediastinotomy for left paratracheal or aortic pulmonary window lesions, and the ne for explain thoracotomy for posterior, subcarinal, and hilar lesions. The noninvasive nature of this technique is greatest in quantity promising for the staging of bronchogenic carcinoma. The combined use of TBNA with the CT scan can have a major impact in succession the management of lung cancer; however, common major problem with TBNA is that it has not been used as widely as it should be, mainly because it is a relatively recently made known procedure with unpredictable results. The sensitivity of TBNA could be improved with correct knowledge of anatomy and technique. This report is intended to describe thc relevant anatomy and technique in using TBNA to assess the mediastinum and hilar lymph nodes in order to evaluate the "N" status in bronchogenic carcinoma. When used together, CT scanning and bronchoscopy retain the sensitivity of the CT scan in discovering abnormal lymph nodes and incorporate the specificity of TBNA to diagnose the confined apartment type of a metastatic lesion in the lymph node.

Definitions or nomenclature of the lymph nodes and in what way they relate to the AJCC theory and the system of the American Thoracic Society (ATS) are described.[13,14] It is not the intent of the author to create a modern system, but rather to use the CT scanning and TBNA advances to describe the mediastinum and hilar lymph node anatomy in a simple, practical manner. The value and definition of the AJCC and ATS lymph node mapping bodys are accepted and recognized; changing the numbering scheme is to accommodate TBNA technique. The in the greatest degree commonly involved lymph nodes and airway branches, used as landmarks for TBNA, are included. from following these landmarks it is possible to sample plane normally sized lymph node tissue from the mediastinum and hilar areas. Four bronchoscopic views or sections from the CT scan are used as first note of the scale reference points: (1) the lower trachea near the carina; (2) the right main bronchus near the right upper lobe orifice; (3) the bronchus intermedius near the middle lobe orifice; and (4) the left main bronchus, near the lower or upper lobe spur

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