A well differentiated, low, intermediate, or high grade neoplasm with neuroendocrine differentiation that arises from the colon or rectum. The disease is colorectal neuroendocrine tumor (EFO_0022924). Also known as: Colorectal NET, Colorectal Neuroendocrine Tumor, Colorectal Well Differentiated Neuroendocrine Neoplasm, Colorectal Well-Differentiated Neuroendocrine Neoplasm, Large Intestinal Neuroendocrine Tumor.