A well differentiated, low grade neuroendocrine tumor (carcinoid tumor) that arises from the ascending colon. 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 ascending colon neuroendocrine tumor G1 (MONDO_0006093). Also known as: ascending colon NET G1, ascending colon carcinoid tumor, ascending colon carcinoid tumor (disease), ascending colon carcinoid tumour, ascending colon carcinoid tumour (disease), ascending colon neuroendocrine neoplasm G1, ascending colon neuroendocrine tumor, well differentiated, low grade, carcinoid tumor of ascending colon.