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Ann Thorac Surg 1984;38:215-220
© 1984 The Society of Thoracic Surgeons

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Articles

Computed Tomography for Evaluation of Mediastinal Lymph Nodes in Lung Cancer: Correlation with Surgical Staging

Section on Cardiothoracic Surgery, Department of Surgery, Bowman Gray School of Medicine of Wake Forest University, Winston-Salem, NC

^* Address reprint requests to Dr. Breyer, Cardiac Surgery Department, Baystate Medical Center, 759 Chestnut St, Springfield, MA 01107

Computed tomography (CT) of the chest (late model) was done preoperatively in 56 candidates for resection of lung cancer. Precise borders for each node region were defined by the American Thoracic Society modification of the classification of the American Joint Committee for Cancer Staging and were used to "map" nodes seen on CT and nodes removed surgically. Metastatic involvement of mediastinal nodes was proven by mediastinoscopy in 11 patients; nodes were removed from multiple regions at thoracotomy in 45 patients. The mediastinum was clearly delineated by CT in 46 patients with determinate scans and was judged normal in 32 (CT-negative scans) and abnormal in 14 (CT-positive scans). A node was considered metastatically involved if it measured greater than 1.5 cm in diameter. Positive nodes were found at surgical staging in 3 of 32 patients with CT-negative scans and in all patients with CT-positive scans. Thus, for the 46 patients with determinate scans, sensitivity was 82%, specificity was 100%, and accuracy (true positive and true negative) was 93%. The high accuracy of CT in these patients suggests that mediastinoscopy is not necessary before thoracotomy in the patient with a CT-negative scan, but that for the patient with a CT-positive or CT-indeterminate scan, the indications for mediastinoscopy remain the same.

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