Colorectal Cancer _ ___________________________________________________________________________
AMERICAN JOINT COMMISSION ON CANCER TNM CLASSIFICATION FOR COLON AND RECTAL CANCER Code Description Primary Tumor (T) TX Primary tumor cannot be evaluated T0 No evidence of primary tumor Tis Carcinoma in situ T1 Tumor extends through the mucosa and into the submucosa T2 Tumor extends through the submucosa and into muscularis propria T3 Tumor extends through the muscularis propria and into the subserosa but not to any neighboring organs or tissues T4a Tumor penetrates to the surface of the visceral peritoneum T4b Tumor directly invades or is adherent to adjacent organs or structures Regional Lymph Node Involvement (N) NX Regional lymph nodes cannot be evaluated N0 No regional nodal involvement N1 Metastasis in 1–3 regional lymph nodes N1a Metastasis in 1 regional lymph node N1b Metastasis in 2–3 regional lymph nodes N1c Tumor deposit(s) in the subserosa, mesentery, or nonperitonealized pericolorectal tissues without regional nodal metastasis N2 Metastasis in 4 or more regional lymph nodes N2a Metastasis in 4–6 regional lymph nodes N2b Metastasis in 7 or more regional lymph nodes Distant Metastasis (M) M0 No distant metastasis M1 Distant metastasis M1a Metastasis confined to one organ or site M1b Metastasis in more than one organ/site or the peritoneum Source: [202] Table 6
72
MDFL2626
Powered by FlippingBook