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Ann Thorac Surg 2000;70:1620-1623
© 2000 The Society of Thoracic Surgeons
a Department of Surgery, Osaka Prefectural Habikino Hospital, Osaka, Japan
Address reprint requests to Dr Inoue, Department of Surgery, Osaka Prefectural Habikino Hospital Habikino 3-7-1, Habikino-city, Osaka 583-8588, Japan
e-mail: masayoshinoue{at}aol.com
Background. The significance of mediastinoscopy for small cell lung cancer is unclear owing to the small number of surgical cases.
Methods. To determine the N component of the TNM staging system, computed tomographic findings and the results of mediastinoscopy were compared with the pathologic examination of surgical specimens.
Results. Four cases among 37 patients (10.8%) were determined as inoperable by mediastinoscopy because of mediastinal lymph node metastasis. A thoracotomy was performed in 33 patients. Six patients (18.2%) who had been judged to have no metastasis by mediastinoscopy were found to have N2 disease after examination of the surgical specimens. In the identification of all mediastinal metastases, mediastinoscopy was 40.0% sensitive, 100% specific, and 83.8% accurate. When the superior mediastinal, paratracheal, pretracheal, tracheobronchial, and subcarinal lymph nodes were defined as approachable nodes, mediastinoscopy was 66.7% sensitive, 100% specific, and 94.6% accurate in the evaluation of these restricted nodes. Four cases among 8 patients with cN1 lesions resulted in a designation as pN2.
Conclusions. Mediastinoscopy is useful for the diagnosis of an approachable mediastinal lymph node in small cell lung cancer cases. This exploration is necessary for patients with small cell lung cancer who are diagnosed as cN1 before thoracotomy.
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