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Constipation with megacolon in a 36-year-old man: a rare presentation of MEN2B from Sri Lanka. Diffuse intestinal ganglioneuromatosis is a rare condition associated with MEN2B. It is also seen in conditions like neurofibromatosis type 1 and Cowden syndrome. This is a report of a patient who underwent total colectomy with end ileostomy creation for a megacolon. He was diagnosed to have diffuse ganglioneuromatosis on histological examination of the resected segment of colon. The definitive management of diffuse ganglioneuromatosis is to resect and anastomose.