If I have a carcinoma of the colon with invasive tumour in the submucosa, but with lymphatics in the muscularis propria containing tumour cells, which do I select, T1 or T2?
T1 (submucosa). The microscopic presence of tumour cells in lymph vessels or veins does not qualify as local spread in the T classification (except tumour cells in veins for liver and kidney). The optional L (lymphatic) and V (venous) classifications can be used to record such involvement. (See TNM 6th ed., p. 14. [8]) 1.
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