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Integumentary System

TNM System of Staging

Tumor; TX primary tumor that cannot be evaluated
Tumor; T0 no evidence of tumor
Tumor; Tis Stage I; Carcinoma in situ, which indicates that the tumor is in a defined location and shows no invasion into surrounding tissues
Tumor; T1, T2, T3, T4 Stage II; Primary tumor size and extent of local invasion, where T1 is small with minimal invasion and T4 is large with extensive local invasion into surrounding organs and tissues
Node; NX regional lymph nodes that cannot be evaluated
Node; N0 regional lymph nodes that show no abnormalities
Node; N1, N2, N3, N4 stage III; degree of lymph node involvement and spread to regional lymph nodes, where N1 is less involvement with minimal spreading and N4 is more involvement with extensive spreading
Metastasis; MX distant metastasis that cannot be evaluated
Metastasis; M0 no evidence of metastasis
Metastasis; MI stage IV; presence of metastasis