Cracking the Code of a Rare Colonic Mesentery Gastrointestinal Neuroendocrine Tumor Disguised as Chronic Gastroenteritis: The Critical Art of Timely Detection.

Neuroendocrine tumors (NETs) typically present in the setting of metastasis from other solid organs and are considered late manifestations of the disease. Therefore, primary tumors are extremely rare. NETs of the colonic mesentery occur more than 70% of the time in the appendix, small intestine, and rectum.