MONDO_0000540 (small intestinal neuroendocrine tumor G1) is a well differentiated, low grade neuroendocrine tumor (carcinoid tumor) that arises from the small intestine. The mitotic count is less than 2 per 10 HPF and/or the Ki67 index is equal to or less than 2 percent. Also known as: carcinoid tumor of small bowel, carcinoid tumor of small intestine, carcinoid tumor of the small bowel, carcinoid tumor of the small intestine, carcinoid tumour of small bowel, carcinoid tumour of small intestine, carcinoid tumour of the small bowel, carcinoid tumour of the small intestine.