In the TNM staging system for lung cancer, what does the T category represent?

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Multiple Choice

In the TNM staging system for lung cancer, what does the T category represent?

Explanation:
The T category in the TNM staging system describes the primary tumor’s size and how far it has grown into nearby structures. It is not about time since diagnosis, tumor markers, or the tissue type of the tumor. The idea is to capture how large the tumor is and how locally invasive it is—for example, a small tumor confined to the lung parenchyma has a lower T, while a larger tumor or one that invades chest wall, diaphragm, mediastinal structures, or major airways has a higher T. This local information, combined with N (lymph node involvement) and M (distant metastasis), determines the overall stage and helps guide treatment decisions.

The T category in the TNM staging system describes the primary tumor’s size and how far it has grown into nearby structures. It is not about time since diagnosis, tumor markers, or the tissue type of the tumor. The idea is to capture how large the tumor is and how locally invasive it is—for example, a small tumor confined to the lung parenchyma has a lower T, while a larger tumor or one that invades chest wall, diaphragm, mediastinal structures, or major airways has a higher T. This local information, combined with N (lymph node involvement) and M (distant metastasis), determines the overall stage and helps guide treatment decisions.

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