system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Hirschsprung disease has association with which of the following conditions?
assistant
The correct answer is  Small number of patients with MEN 2A have associated Hirschsprung disease. In MEN2A/Hirschsprung 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.