MONDO_0006091 (appendix neuroendocrine tumor G1) is a well differentiated, low grade tumor with neuroendocrine differentiation that arises from the appendix. 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: appendiceal carcinoid tumor, appendiceal carcinoid tumour, appendix NET G1, appendix NET G1 (carcinoid), appendix carcinoid tumor, appendix carcinoid tumour, appendix neuroendocrine tumor G1 (carcinoid), appendix neuroendocrine tumour G1 (carcinoid).