small intestine neuroendocrine neoplasm (MONDO_0018510, a Monarch Disease Ontology term) is a neoplasm with neuroendocrine differentiation that arises from the small intestine. It includes well differentiated neuroendocrine tumors (low and intermediate grade) and poorly differentiated neuroendocrine carcinomas (high grade). Also known as: NET of the small intestine, neuroendocrine neoplasm of small intestine, neuroendocrine neoplasm of the small intestine, neuroendocrine tumor of small bowel, neuroendocrine tumour of small bowel, small intestinal neuroendocrine neoplasm, small intestine NET, small intestine neuroendocrine tumor.