Evaluating the Presence of a Stage IV Low-Grade Well-Differentiated Neuroendocrine Tumor of the Ileocecum: A Case Report with Evaluation of Staging Protocol of Neuroendocrine Tumors and Treatment Options Based on Current Available Evidence

Table 1

NET of the jejunum and ileum TNM staging AJCC UICC 8th edition.

Primary tumor (T)		Regional lymph nodes (N)		Distant metastasis (M)
T category	T criteria	N category	N criteria	M category	M criteria
T0	No evidence of a primary tumor	N0	No regional LN metastasis	M0	No distant metastasis
T1	Tumor invades lamina propria or submucosa and <1 cm or equal to	N1	Regional LN metastasis of less than 12 nodes	M1	Distant metastasis
T2	Tumor invades muscularis propria or >1 cm	N2	Large mesenteric masses >2 cm and/or >12 nodal deposits
T3	Tumor invades into subserosal tissue without penetration of overlying serosa
T4	Tumor invades the visceral peritoneum or other organs and adjacent structures