A well differentiated, low grade neuroendocrine tumor (carcinoid tumor) that arises from the ileum. The mitotic count is less than 2 per 10 HPF and/or the Ki67 index is equal to or less than 2 percent. The disease is ileal neuroendocrine tumor G1 (MONDO_0006250). Also known as: carcinoid tumor of ileum, carcinoid tumor of the ileum, carcinoid tumour of ileum, carcinoid tumour of the ileum, grade 1 neuroendocrine neoplasm of ileum, ileal NET G1, ileal carcinoid tumor, ileal carcinoid tumour.