colonic aganglionosis incidence/prevalence measurement percentage of study population developing colonic aganglionosis during a period of time 2013-10-16T10:37:17Z CMO:0001839 Hirschsprung disease incidence JSmith MESH:D006627 The number of new cases of colonic aganglionosis appearing in a study population during a certain period compared to the total number of individuals in the study population, expressed as a percentage. Colonic aganglionosis is the absence of parasympathetic ganglion cells in any or all of the myenteric plexus, a network of autonomic nerve fibers within the tunica muscularis of the wall of the alimentary canal in general and of the colon in particular. The colon is the segment of the large intestine between the cecum and the rectum. VT:0010901 clinical_measurement_ontology colonic aganglionosis incidence intestinal aganglionosis incidence