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
A 60-year old male pressents with progressivp difficulty in swallowing, vomiting and ocLsional regurgitation for the past 3 months. Barium studies showed marked dilatation of the upper esophagus with narrowmg of the lower segment. Manometry showed absent esophageal peristalsis. The pathogenesis of this condition is most likely related to-
assistant
The correct answer is  Hirschsprung's disease is a congenital disorder of the colon in which ceain nerve cells, known as ganglion cells, are absent, causing chronic constipation. The lack of ganglion cells is in the myenteric plexus (Auerbach's plexus), which is responsible for moving food in the intestine. Ref Davidson edition23rd pg 796