<prompt> Hirschsprung disease has association with which of the following conditions?Von Hippel LindauMEN IMEN 2AMEN 2B  <response>: Small number of patients with MEN 2A have associated Hirschsprung disease. In MEN2AHirschsprung disease variant aganglioneuromatosis may be found throughout the colon or in smaller segments. Characteristic features of MEN 2A are medullary carcinoma of thyroid, pheochromocytoma and parathyroid adenoma. Ref: Harrisons Internal Medicine, 16th Edition, Chapter 295, Pages 2231-34. 