Question:
What is the T stage of a 2.5cm lung carcinoma, not involving the pleura?
What is the T stage of a 2.5cm lung carcinoma, not involving the pleura?
Updated On: Jul 15, 2025
- T1a
- T2
- T1b
- T1c
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The Correct Option is D
Solution and Explanation
In determining the T stage for lung cancer according to the TNM (Tumor, Node, Metastasis) classification, the size of the tumor plays a crucial role. The classification is as follows:
- T1a: Tumor ≤1 cm in greatest dimension.
- T1b: Tumor >1 cm but ≤2 cm.
- T1c: Tumor >2 cm but ≤3 cm.
- T2: Tumor >3 cm and ≤5 cm or other characteristics.
In the given scenario, the carcinoma measures 2.5 cm in diameter and does not involve the pleura. Since it falls within the range >2 cm but ≤3 cm, it categorizes the tumor as T1c.
| Stage | Tumor Size |
|---|---|
| T1a | ≤1 cm |
| T1b | >1 cm ≤2 cm |
| T1c | >2 cm ≤3 cm |
| T2 | >3 cm ≤5 cm or other |
Thus, the correct T stage for a 2.5 cm lung carcinoma not involving the pleura is T1c.
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