Boy awaiting anal
J Pediatr Surg. Acquired aganglionosis: a rare occurrence following pull-through procedures for Hirschsprung's disease. Hirschsprung's disease HD is a neurogenic form of intestinal obstruction characterized by a congenital absence of ganglion cells in the submucosal and myenteric plexuses. Acquired aganglionosis AAG is a rare condition that may occur following various pull-through procedures for HD.