Gastrointestinal neuroendocrine tumors are either carcinoid tumors of enterochromaffin cells or,as in the case of somatostatinoma,tumors of the:

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Gastrointestinal neuroendocrine tumors can be either carcinoid tumors of enterochromaffin cells or tumors of pancreatic endocrine cells, such as somatostatinoma. The other options (gastric parietal cells, cells in the brush border of the small intestine, and small bowel mucosal cells) are not typically associated with these types of tumors.

Gastrointestinal Neuroendocrine Tumors Are Either Carcinoid Tumors of Enterochromaffin Cells