Question

What is the T stage of a 2.5cm lung carcinoma, not involving the pleura?

• A. T_1a
• B. T₂
• C. T_1b
• D. T_1c

Answer 1

The Correct Option is D

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: 

• T_1a: Tumor ≤1 cm in greatest dimension.
• T_1b: Tumor >1 cm but ≤2 cm.
• T_1c: 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 T_1c.

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 T_1c.