colonic aganglionosis incidence/prevalence measurement percentage of study population displaying colonic aganglionosis at a point in time 2013-10-16T10:37:12Z CMO:0001838 Hirschsprung disease prevalence MESH:D006627 The number of individuals in a study population which display colonic aganglionosis at a certain point in time 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. clinical_measurement_ontology colonic aganglionosis prevalence intestinal aganglionosis prevalence jsmith