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Fig. 1. T factor is determined by size, location, invasion, and number of primary tumors. Location of metastatic lymph nodes defines the N factor. The M factor refers to metastasis: malignant pleural or pericardial metastasis is M1a, single extrathoracic metastasis is M1b, and multiple extrathoracic metastasis is M1c. These images and content are from the chapter 6 in the book of . Permission for use of this material was granted by IASLC.
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