Appendiceal neuroendocrine tumors: Recent insights and clinical implications

Table 1 Classification and staging of appendiceal NETs according to the TNM system

Stage	T	N	M
I	Τ1	Ν0	Μ0
II	Τ1	Ν1	Μ0
	Τ2	Ν0	Μ0
III	Τ2	Ν1	Μ0
	Τ3	Any Ν	Μ0
IV	Any Τ	Any Ν	Μ1

NETs: Neuroendocrine tumors; T1: Tumor < 2 cm; T2: Tumor ≥ 2 cm but < 3 cm; T3: Tumor ≥ 3 cm; N0: No lymph node metastases; N1: Regional lymph node metastases; M0: No metastases; M1: Distant metastases.