. Author manuscript; available in PMC: 2016 Aug 17.

Published in final edited form as: Endocr Pract. 2015 May;21(5):534–545. doi: 10.4158/EP14464.DSC

Table 2.

Nomenclature for Midgut Carcinoid—Adapted from the NANETS Consensus Guidelines for the Diagnosis and Management of Neuroendocrine Tumors (26)

Grade	Traditional	ENETs, WHO	Based on Moran
Low	Carcinoid tumor	Neuroendocrine tumor, grade 1 (G1)	Neuroendocrine carcinoma, grade 1
Intermediate	Carcinoid tumor	Neuroendocrine tumor, grade 2 (G2)	Neuroendocrine carcinoma, grade 2
High	Small-cell carcinoma	Neuroendocrine carcinoma, grade 3 (G3), small-cell carcinoma	Neuroendocrine carcinoma, grade 3, small-cell carcinoma
	Large-cell neuroendocrine carcinoma	Neuroendocrine carcinoma, grade 3 (G3), large-cell neuroendocrine	Neuroendocrine carcinoma, grade 3, large-cell neuroendocrine

Abbreviations: ENETS = European Neuroendocrine Tumor Society; NANETS = North American Neuroendocrine Tumor Society; WHO = World Health Organization.