Table 5 TNM staging

Neuroendocrine tumors:

T:

 Tx: Primary tumor which cannot be evaluated.

 T0: No primary tumor was found in the appendix.

 T1: Tumor with up to 2 cm dimension.

  T1a: Up to one centimeter.

  T1b: Up to 2 cm.

 T2: Greater than two up to 4 cm or with extensions to the caecum.

 T3: Greater than 4 cm or extension to the ileum.

 T4: Tumor invades abdominal wall or adjacent organs or perforated tumor

N:

 NX: Nodal staging could not be evaluated for lack of information.

 N0: Absence of metastasis in regional lymph nodes

 N1: Presence of metasis in regional lymph nodes

M:

 M0: Absence of distant metastasis

 M1: Presence of distant metastasis

 Stadium I: T1N0M0.

 Stadium II: T2/T3N0M0.

 Statium III: TN1M0 / T4N0M0.

 Statium IV: TNM1.