The current staging system is recommended for the classification of both non–small cell and small cell lung carcinomas and for carcinoid tumors of the lung .
TNM Staging of Lung Cancer
Primary Tumor (T)
The “T” staging of bronchogenic carcinoma is a bit complex compared to others. Five things must be checked before assigning a T classification. They can be remembered with a mnemonic: ABCDE.
1. Atelectasis
2. Bronchus involvement (bronchoscopy)
3. Contiguous conquer (Adjacent site invasion)
4. Diameter in cm
5. Elevated nodules
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